Electronic devices and systems

ABSTRACT

The disclosed system may include a watch band, a watch body comprising at least one image sensor configured to capture a wide-angle image, a coupling mechanism configured to detachably couple the watch body to the watch band, and at least one biometric sensor on at least one of the watch band or the watch body. Various other related methods and systems are also disclosed.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Non-Provisional patentapplication Ser. No. 17/210,547, titled “ELECTRONIC SYSTEM AND RELATEDDEVICES AND METHODS,” filed Mar. 24, 2021, which claims the benefit ofU.S. Provisional Patent Application No. 63/015,410, titled “SPLITARCHITECTURE FOR A WRISTBAND SYSTEM AND RELATED DEVICES AND METHODS,”filed on Apr. 24, 2020, and U.S. Provisional Patent Application No.63/056,345, titled “SPLIT ARCHITECTURE FOR A WRISTBAND SYSTEM ANDRELATED DEVICES AND METHODS,” filed on Jul. 24, 2020, the disclosure ofeach of which is incorporated, in its entirety, by this reference.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate a number of example embodiments andare a part of the specification. Together with the followingdescription, these drawings demonstrate and explain various principlesof the present disclosure.

FIG. 1A is a plan view of an example wristband system, according to atleast one embodiment of the present disclosure.

FIG. 1B is a side view of the example wristband system of FIG. 1A,according to at least one embodiment of the present disclosure.

FIG. 2A is a perspective view of an example wristband system, accordingto at least one embodiment of the present disclosure.

FIG. 2B is a side view of another example wristband system, according toat least one embodiment of the present disclosure.

FIG. 2C is a perspective view of another example wristband system,according to at least one embodiment of the present disclosure.

FIG. 3 is an example block diagram of a wristband system, according toat least one embodiment of the present disclosure.

FIG. 4 is a cross-sectional plan view of a detachable wristband system,according to at least one embodiment of the present disclosure.

FIG. 5 is a detailed cross-sectional view of a wristband couplingmechanism, according to at least one embodiment of the presentdisclosure.

FIG. 6 is a perspective view of a wristband coupling mechanism,according to at least one embodiment of the present disclosure.

FIG. 7 is a partial cross-sectional view of a wristband couplingmechanism that prevents vertical movement, according to at least oneembodiment of the present disclosure.

FIG. 8 is a partial cross-sectional view of a wristband couplingmechanism that prevents rotational movement, according to at least oneembodiment of the present disclosure.

FIG. 9 is a bottom perspective view of an example watch body, accordingto at least one embodiment of the present disclosure.

FIG. 10 is a top perspective view of an example watch band, according toat least one embodiment of the present disclosure.

FIG. 11 is a perspective view of an example watch body uncoupled from anexample watch band, according to at least one embodiment of the presentdisclosure.

FIG. 12 is a detailed perspective view of a portion of an example watchband, according to at least one embodiment of the present disclosure.

FIG. 13 is a cross-sectional view of a push-button unlatching mechanism,according to at least one embodiment of the present disclosure.

FIG. 14A is a top plan view of an example watch band profile, accordingto at least one embodiment of the present disclosure.

FIG. 14B is a cross-sectional view of an example watch band with aconcentric profile, according to at least one embodiment of the presentdisclosure.

FIG. 14C is a cross-sectional view of an example watch band with anon-concentric profile, according to at least one embodiment of thepresent disclosure.

FIG. 15 is a flow diagram illustrating an example method of decoupling awatch body from a watch band, according to at least one embodiment ofthe present disclosure.

FIG. 16 is an illustration of exemplary augmented-reality glasses thatmay be used in connection with embodiments of this disclosure.

FIG. 17 is an illustration of an exemplary virtual-reality headset thatmay be used in connection with embodiments of this disclosure.

FIG. 18 is an illustration of exemplary haptic devices that may be usedin connection with embodiments of this disclosure.

FIG. 19 is an illustration of an exemplary virtual-reality environmentaccording to embodiments of this disclosure.

FIG. 20 is an illustration of an exemplary augmented-reality environmentaccording to embodiments of this disclosure.

FIGS. 21A and 21B are illustrations of an exemplary human-machineinterface configured to be worn around a user's lower arm or wrist.

FIGS. 22A and 22B are illustrations of an exemplary schematic diagramillustrating internal components of a wearable system.

Throughout the drawings, identical reference characters and descriptionsindicate similar, but not necessarily identical, elements. While theexample embodiments described herein are susceptible to variousmodifications and alternative forms, specific embodiments have beenshown by way of example in the drawings and will be described in detailherein. However, the example embodiments described herein are notintended to be limited to the particular forms disclosed. Rather, thepresent disclosure covers all modifications, equivalents, andalternatives falling within the scope of the appended claims.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

Wearable devices may be configured to be worn on a user's body part,such as a user's wrist or arm. Such wearable devices may be configuredto perform various functions. A wristband system may be an electronicdevice worn on a user's wrist that performs functions such as deliveringcontent to the user, executing social media applications, executingartificial-reality applications, messaging, web browsing, sensingambient conditions, interfacing with head-mounted displays, monitoringthe health status associated with the user, etc. However, since wearabledevices are typically worn on a body part of a user, a wristband systemmay present an encumbrance to the user, such as when the user issleeping or engaged in a sporting activity.

The present disclosure details systems, devices, and methods related toa wristband system that includes a watch band that detachably couples toa watch body. The watch body may include a coupling mechanism forelectrically and mechanically coupling the watch body to the watch band.The wristband system may have a split architecture that allows the watchband and the watch body to operate both independently and incommunication with one another. The mechanical architecture may includea coupling mechanism on the watch band and/or the watch body that allowsa user to conveniently attach and detach the watch body from the watchband. Advantages of the present disclosure may include reducing anencumbrance to a user donning the watch band when the watch body isdecoupled from the watch band as compared to when the watch body iscoupled to the watch band. Advantages of the present disclosure may alsoinclude reducing an overall power consumption and extending batterycharge time of the wristband system by enabling each of the watch bodyand watch band to have independent power consumption modes.

The wristband system may be used in conjunction with anartificial-reality (AR) system. Sensors of the wristband system (e.g.,image sensors, inertial measurement unit (IMU), etc.) may be used toenhance an AR application running on the AR system. Further, the watchband may include sensors that measure biometrics of the user. Forexample, the watch band may include neuromuscular sensors (e.g.,neuromuscular sensors 2110 of FIG. 21A) disposed on an inside surface ofthe watch band contacting the user that detects the muscle intentions ofthe user. The AR system may include a head-mounted display that isconfigured to enhance a user interaction with an object within the ARenvironment based on the muscle intentions of the user. Signals sensedby the neuromuscular sensors may be processed and used to provide a userwith an enhanced interaction with a physical object and/or a virtualobject in an AR environment. For example, the AR system may operate inconjunction with the neuromuscular sensors to overlay one or more visualindicators on or near an object within the AR environment such that theuser could perform “enhanced” or “augmented” interactions with theobject.

In some examples, the wristband system may have sufficient processingcapabilities (e.g., CPU, memory, bandwidth, battery power, etc.) tooffload computing tasks from a head-mounted display (HMD) to thewristband system. Methods of the present disclosure may determine acomputing task of the HMD that is suitable for processing on availablecomputing resources of the watch body. The computing task to beoffloaded may be determined based on computing requirements, powerconsumption, battery charge level, latency requirements, or acombination thereof. The tasks offloaded to the watch body may includeprocessing images captured by image sensors of the HMD, a locationdetermining task, a neural network training task, etc. The watch bodymay process the computing task and return the results to the HMD. Insome examples, offloading computing tasks from the HMD to the wristbandsystem may reduce heat generation, reduce power consumption and/ordecrease computing task execution latency in the HMD.

In some examples, a head-mounted display (HMD) may have sufficientprocessing capabilities (e.g., central processing unit (CPU), memory,bandwidth, battery power, etc.) to offload computing tasks from thewristband system (e.g., a watch body, a watch band) to the HMD. Methodsof the present disclosure may include determining a computing task ofthe wristband system that is suitable for processing on availablecomputing resources of the HMD. By way of example, the computing task tobe offloaded may be determined based on computing requirements, powerconsumption, battery charge level, latency requirements, or acombination thereof. The tasks offloaded to the HMD may includeprocessing images captured by image sensors of the wristband system, alocation determining task, a neural network training task, etc. The HMDmay process the computing task(s) and return the results to thewristband system. In some examples, offloading computing tasks from thewristband system to the HMD may reduce heat generation, reduce powerconsumption and/or decrease computing task execution latency in thewristband system.

In some examples, the wristband system may include multiple electronicdevices including, without limitation, a smartphone, a server, a HMD, alaptop computer, a desktop computer, a gaming system, Internet of thingsdevices, etc. Such electronic devices may communicate with the wristbandsystem (e.g., via a personal area network). The wristband system mayhave sufficient processing capabilities (e.g., CPU, memory, bandwidth,battery power, etc.) to offload computing tasks from each of themultiple electronic devices to the wristband system. Additionally oralternatively, each of the multiple electronic devices may havesufficient processing capabilities (e.g., CPU, memory, bandwidth,battery power, etc.) to offload computing tasks from the wristbandsystem to the electronic device(s).

The following will provide, with reference to FIGS. 1-22B, detaileddescriptions of a split architecture for a wristband system includingrelated devices and methods. First, a description of a wristband systemincluding a watch band, a watch body, and a method of decoupling thewatch body from the watch band is presented in reference to FIGS. 1A and1B. A description of integrating neuromuscular sensors of the watch bodywith an AR system is presented in reference to FIGS. 2A, 2B, and 2C. Anexample block diagram of a split architecture for a wristband system ispresented in reference to FIG. 3 . Various types of mechanisms fordetachably coupling a watch body to a watch band are presented inreference to FIGS. 4-14 . A method of selectively offloading a computingtask of a head-mounted display to a watch body is presented in referenceto FIG. 9 . Various types of example artificial-reality devices that maybe used in conjunction with a wristband system are presented inreference to FIGS. 16-22B.

FIG. 1A illustrates an example wristband system 100 that includes awatch body 104 coupled to a watch band 112. Watch body 104 and watchband 112 may have any size and/or shape that is configured to allow auser to wear wristband system 100 on a body part (e.g., a wrist).Wristband system 100 may include a retaining mechanism 113 (e.g., abuckle) for securing watch band 112 to the user's wrist. Wristbandsystem 100 may also include a coupling mechanism 106, 110 for detachablycoupling watch body 104 to watch band 112. Wristband system 100 mayperform various functions associated with the user. The functions may beexecuted independently in watch body 104, independently in watch band112, and/or in communication between watch body 104 and watch band 112.Watch band 112 may be configured to operate independently (e.g., executefunctions independently) from watch body 104. Additionally oralternatively, watch body 104 may be configured to operate independently(e.g., execute functions independently) from watch band 112. As will bedescribed in more detail below with reference to the block diagram ofFIG. 3 , watch band 112 and/or watch body 104 may each include theindependent resources required to independently execute functions. Forexample, watch band 112 and/or watch body 104 may each include a powersource (e.g., a battery), a memory, data storage, a processor (e.g., aCPU), communications, a light source (e.g., at least one infrared LEDfor tracking watch body 104 and/or watch band 112 in space with anexternal sensor), and/or input/output devices.

As will be described in more detail below with reference to FIG. 3 ,functions that may be independently executed by watch body 104, by watchband 112, or by wristband system 100 may include, without limitation,display of visual content to the user (e.g., visual content displayed ondisplay screen 102), sensing user input (e.g., sensing a touch on button108, sensing biometric data with sensor 114, sensing neuromuscularsignals with sensor 115, etc.), messaging (e.g., text, speech, video,etc.), image capture (e.g., with a front-facing image sensor 115A and/ora rear-facing image sensor 115B), wireless communications (e.g.,cellular, near field, WiFi, personal area network, etc.), locationdetermination, financial transactions, providing haptic feedback, etc.Functions may be independently executed by watch body 104, by watch band112, or on wristband system 100 in conjunction with anartificial-reality system such as the artificial-reality systemsdescribed in FIGS. 16-22B. In some examples, wristband system 100 mayinclude vibrotactile system 1800 of FIG. 18 , haptic device 2030 of FIG.20 , and/or neuromuscular sensors 2110 of FIG. 21A.

In some examples, display screen 102 may display visual content to theuser. In some examples, watch body 104 may determine an orientation ofdisplay screen 102 of watch body 104 relative to an eye gaze directionof a user and may orient content viewed on display screen 102 to the eyegaze direction of the user. The displayed visual content may be orientedto the eye gaze of the user such that the content is easily viewed bythe user without user intervention. Traditional displays on wristbandsystems may orient the visual content in a static manner such that whena user moves or rotates the wristband system, the content may remain inthe same position relative to the watch band system causing difficultyfor the user to view the content.

Embodiments of the present disclosure may orient (e.g., rotate, flip,stretch, etc.) the displayed content such that the displayed contentremains in substantially the same orientation relative to the eye gazeof the user (e.g., the direction in which the user is looking). Thedisplayed visual content may also be modified based on the eye gaze ofthe user without user intervention. For example, in order to reduce thepower consumption of wristband system 100, display screen 102 may dimthe brightness of the displayed content, pause the displaying of videocontent, or power down display screen 102 when it is determined that theuser is not looking at display screen 102. In some examples, a sensor(s)of wristband system 100 may determine an orientation of display screen102 relative to an eye gaze direction of the user.

Embodiments of the present disclosure may measure the position,orientation, and/or motion of eyes of the user in a variety of ways,including through the use of optical-based eye-tracking techniques,ultrasound-based eye-tracking techniques, etc. For example, front-facingimage sensor 115A and/or rear-facing image sensor 115B may captureimages of the user's eyes and determine the eye gaze direction based onprocessing of the captured images. The captured images may be processedusing CPU 326, microcontroller unit 352 (see FIG. 3 ), a processor incommunication with wristband system 100 (e.g., a processor of ahead-mounted display (HMD)), or a combination thereof.

In some examples, sensors other than sensors of wristband system 100 maybe used to determine the user's eye gaze direction. For example, aneye-tracking subsystem of an HMD (e.g., augmented-reality system 1600 ofFIG. 16 , virtual-reality system 1700 of FIG. 17 , head-mounted display1902 of FIG. 19 , or augmented-reality glasses 2020 in FIG. 20 ) incommunication with wristband system 100 may include a variety ofdifferent sensors, such as two-dimensional (2D) or three-dimensional(3D) cameras, time-of-flight depth sensors, single-beam or sweepinglaser rangefinders, 3D LiDAR sensors, that may be used to determine andtrack the eye gaze of the user. In this example, a processing subsystemmay process data from one or more of these sensors to measure, detect,determine, and/or otherwise monitor the position, orientation, and/ormotion of the user's eye(s). Display screen 102 may receive the eyetracking information from the HMD, CPU 326, microcontroller unit 352, ora combination thereof, and orient the displayed content based on theuser's eye gaze direction.

In some examples, watch body 104 may be communicatively coupled to anHMD (e.g., augmented-reality system 1600 of FIG. 16 , virtual-realitysystem 1700 of FIG. 17 , head-mounted display 1902 of FIG. 19 , oraugmented-reality glasses 2020 in FIG. 20 ). Front-facing image sensor115A and/or rear-facing image sensor 115B may capture wide-angle imagesof the area surrounding front-facing image sensor 115A and/orrear-facing image sensor 115B such as hemispherical images (e.g., atleast hemispherical, substantially spherical, etc.), 180-degree images,360-degree area images, panoramic images, ultra-wide area images, or acombination thereof. In some examples, front-facing image sensor 115Aand/or rear-facing image sensor 115B may be configured to capture imageshaving a range between 45 degrees and 360 degrees. In some examples,watch body 104 may be communicatively coupled to the HMD and the HMD maybe configured to display at least a portion of a captured image (e.g., awide-angle image). The captured images may be communicated to the HMDand at least a portion of the captured images may be displayed to theuser on the HMD. The images may be captured in 2D and/or 3D anddisplayed to the user in 2D and/or 3D. In some examples, the capturedimages may be displayed to the user in conjunction with anartificial-reality application. Images captured by front-facing imagesensor 115A and/or rear-facing image sensor 115B may be processed beforedisplaying on the HMD. For example, certain features and/or objects(e.g., people, faces, devices, backgrounds, etc.) of the captured imagemay be subtracted, added, and/or enhanced before displaying on the HMD.

FIG. 1B illustrates an example wristband system 100 that includes awatch body 104 decoupled from a watch band 112. Watch band 112 may bedonned (e.g., worn) on a body part (e.g., a wrist) of a user and mayoperate independently from watch body 104. For example, watch band 112may be configured to be worn by a user and an inner surface of watchband 112 may be in contact with the user's skin. When worn by a user,sensor 114 may be in contact with the user's skin. Sensor 114 may be abiosensor that senses a user's heart rate, bioimpedance, saturatedoxygen level, temperature, sweat level, muscle intentions, steps taken,or a combination thereof. Watch band 112 may include multiple sensors114 that may be distributed on an inside surface, in an interior volume,and/or on an outside surface of watch band 112. Sensor 114 may alsoinclude a sensor that provides data about a user's environment includinga user's motion (e.g., an IMU), altitude, location, orientation, gait(e.g., a pedometer), or a combination thereof. Watch band 112 maytransmit the data acquired by sensor 114 to watch body 104 using a wiredcommunication method (e.g., a Universal Asynchronous ReceiverTransmitter (UART), a Universal Serial Bus (USB) transceiver, etc.)and/or a wireless communication method (e.g., near field communication,Bluetooth™, etc.). In some examples, watch body 104 may include anelectrical connector 118 that mates with connector 120 of watch band 112for wired communication and/or power transfer. In some examples, watchbody 104 and watch band 112 may include wireless communication devicessuch as those described with reference to FIG. 3 below.

Watch band 112 and/or watch body 104 may include a haptic device 116(e.g., a vibratory haptic actuator) that is configured to provide hapticfeedback (e.g., a cutaneous and/or kinesthetic sensation) to the user'sskin. Watch band 112 and/or watch body 104 may include a haptic actuatorthat is configured to provide haptic feedback to a user based on atleast one of instructions from watch body 104 or instructions from ahead-mounted display of an artificial-reality system. Sensor 114 and/orhaptic device 116 may be configured to operate in conjunction withmultiple applications including, without limitation, health monitoring,social media, game playing, and artificial reality (e.g., theapplications associated with artificial reality as described below withreference to FIGS. 16-22B). As described in detail below with referenceto FIG. 2A, an electromyography sensor (e.g., neuromuscular sensor 2110of FIG. 21A) integrated into watch band 112 and/or watch body 104 maysense a user's muscle intention. The sensed muscle intention may betransmitted to an artificial-reality system (e.g., the augmented-realitysystem 1600 in FIG. 16 or the virtual-reality system 1700 in FIG. 17 )to perform an action in an associated artificial-reality environment,such as to control a physical and/or virtual object displayed to theuser. Further, the artificial-reality system may provide haptic feedbackto the user in coordination with the artificial reality application viahaptic device 116.

Wristband system 100 may include a coupling mechanism for detachablycoupling watch body 104 to watch band 112. A user may detach watch body104 from watch band 112 in order to reduce the encumbrance of wristbandsystem 100 to the user. Detaching watch body 104 from watch band 112 mayreduce a physical profile and/or a weight of wristband system 100.Wristband system 100 may include a watch body coupling mechanism(s) 106and/or a watch band coupling mechanism(s) 110. Any method or couplingmechanism may be used for detachably coupling watch body 104 to watchband 112. For example, the mechanisms described below with reference toFIGS. 4-14C may be used for detachably coupling watch body 104 to watchband 112. A user may perform any type of motion to couple watch body 104to watch band 112 and to decouple watch body 104 from watch band 112.For example, a user may twist, slide, turn, push, pull, or rotate watchbody 104 relative to watch band 112, or a combination thereof, to attachwatch body 104 to watch band 112 and to detach watch body 104 from watchband 112.

Watch body coupling mechanism(s) 106 and/or watch band couplingmechanism(s) 110 may include any type of mechanism that allows a user torepeat cycles of coupling and decoupling of watch body 104 relative towatch band 112. Watch body coupling mechanism(s) 106 and/or watch bandcoupling mechanism(s) 110 may include, without limitation, arotation-based connector, a shear-pin coupler, a retention spring, oneor more magnets, a clip, a pin shaft, a hook and loop fastener, or acombination thereof.

As illustrated in FIG. 1B, in some examples, watch body 104 may includefront-facing image sensor 115A and rear-facing image sensor 115B.Front-facing image sensor 115A may be located in a front face of watchbody 104 and rear-facing image sensor 115B may be located in a rear faceof watch body 104. In some examples, a level of functionality of atleast one of watch band 112 or watch body 104 may be modified when watchbody 104 is detached from watch band 112. The level of functionalitythat may be modified may include the functionality of front-facing imagesensor 115A and/or rear-facing image sensor 115B. By way of example, auser may use front-facing image sensor 115A to capture an image (e.g., astill image or a video) of the user, for a so-called “selfie view,” whenwatch body 104 is attached to or detached from watch band 112. Whenwatch body 104 is detached from watch band 112, the user may userear-facing image sensor 115B to capture an image (e.g., a still imageor a video) of a scene or object away from the user, for a so-called“world view.” Although FIG. 1B shows a single front-facing image sensor115A and a single rear-facing image sensor 115B, the present disclosureis not so limited. Rather, watch body 104 may include multiplefront-facing image sensors 115A and/or multiple rear-facing imagesensors 115B. Additionally or alternatively, watch band 112 may includeat least one front-facing image sensor 115A and at least one rear-facingimage sensor 115B. Of course, the orientation at which the user holdswatch body 104 may alter whether the image sensors 115A and 115B arerespectively used for a selfie view or a world view.

In some examples, image sensors 115A and/or 115B may be oriented tocapture a first wide-angle image in a first direction. In some examples,image sensors 115A and/or 115B may be oriented to capture a secondwide-angle image in a second direction opposite the first direction. Thesystem may be configured to stitch the first wide-angle image and thesecond wide-angle image together to create a combined image. In someembodiments, images from front-facing image sensor 115A and fromrear-facing image sensor 115B may be stitched together (e.g., with aprocessor) to provide a single, wide-angle image (e.g., at leasthemispherical, substantially spherical, a wide-angle view, etc.), a180-degree image, 360-degree image, a panoramic image, an ultra-widearea image, an image within the range of 45 degrees and 360 degrees, ora combination thereof, surrounding watch body 104. In some embodiments,front-facing image sensor 115A may be a wide-angle image sensor that mayalone be configured to capture at least a hemispherical view surroundingwatch body 104. In some examples, when watch body 104 is attached towatch band 112, rear-facing image sensor 115B or a portion thereof(e.g., certain pixels thereof) may be used to optically sense biometricdata of the user.

FIG. 2A illustrates a perspective view of an example wristband system200 that includes a watch body 204 decoupled from a watch band 212.Wristband system 200 may be structured and/or function similarly towristband system 100 of FIGS. 1A and 1B. Watch body 204 and watch band212 may have a substantially rectangular or circular shape and may beconfigured to allow a user to wear wristband system 200 on a body part(e.g., a wrist). Wristband system 200 may include a retaining mechanism213 (e.g., a buckle, a hook and loop fastener, etc.) for securing watchband 212 to the user's wrist. Wristband system 200 may also include acoupling mechanism 206 for detachably coupling watch body 204 to watchband 212 such as the mechanisms described below with reference to FIGS.4-14C.

Wristband system 200 may perform various functions associated with theuser as described above with reference to FIGS. 1A and 1B. As will bedescribed in more detail with reference to FIG. 3 , functions executedby wristband system 200 may include, without limitation, display ofvisual content to the user (e.g., visual content displayed on displayscreen 202), sensing user input (e.g., sensing a touch on button 208,sensing biometric data on sensor 214, sensing neuromuscular signals onneuromuscular sensor 215, etc.), messaging (e.g., text, speech, video,etc.), image capture (e.g., with a front-facing image sensor 203 and/ora rear-facing image sensor), wireless communications (e.g., cellular,near field, WiFi, personal area network, etc.), location determination,financial transactions, providing haptic feedback, alarms,notifications, biometric authentication, health monitoring, sleepmonitoring, etc. These functions may be executed independently in watchbody 204, independently in watch band 212, and/or in communicationbetween watch body 204 and watch band 212. Functions may be executed onwristband system 200 in conjunction with an artificial-reality systemsuch as the artificial-reality systems described in FIGS. 16-22B. Insome examples, wristband system 200 may include vibrotactile system 1800of FIG. 18 and/or haptic device 1930 of FIG. 19 .

Watch band 212 may be configured to be worn by a user such that an innersurface of watch band 212 may be in contact with the user's skin. Whenworn by a user, sensor 214 may be in contact with the user's skin.Sensor 214 may be a biosensor that senses a user's heart rate, saturatedoxygen level, temperature, sweat level, muscle intentions, or acombination thereof. Watch band 212 may include multiple sensors 214that may be distributed on an inside and/or an outside surface of watchband 212. Additionally or alternatively, watch body 204 may include thesame or different sensors than watch band 212. For example, multiplesensors may be distributed on an inside and/or an outside surface ofwatch body 204. As described below with reference to FIG. 3 , watch body204 may include, without limitation, front-facing image sensor 115A,rear-facing image sensor 115B, a biometric sensor, an IMU, a heart ratesensor, a saturated oxygen sensor, a neuromuscular sensor(s) (e.g.,neuromuscular sensors 2110 of FIG. 21A), an altimeter sensor, atemperature sensor, a bioimpedance sensor, a pedometer sensor, anoptical sensor, a touch sensor, a sweat sensor, etc. Sensor 214 may alsoinclude a sensor that provides data about a user's environment includinga user's motion (e.g., an IMU), altitude, location, orientation, gait,or a combination thereof. Sensor 214 may also include a light sensor(e.g., an infrared light sensor, a visible light sensor) that isconfigured to track a position and/or motion of watch body 204 and/orwatch band 212. Watch band 212 may transmit the data acquired by sensor214 to watch body 204 using a wired communication method (e.g., a UART,a USB transceiver, etc.) and/or a wireless communication method (e.g.,near field communication, Bluetooth™, etc.). Watch band 212 may beconfigured to operate (e.g., to collect data using sensor 214)independent of whether watch body 204 is coupled to or decoupled fromwatch band 212.

Watch band 212 and/or watch body 204 may include a haptic device 216(e.g., a vibratory haptic actuator) that is configured to provide hapticfeedback (e.g., a cutaneous and/or kinesthetic sensation, etc.) to theuser's skin. Sensor 214 and/or haptic device 216 may be configured tooperate in conjunction with multiple applications including, withoutlimitation, health monitoring, social media, game playing, andartificial reality (e.g., the applications associated with artificialreality as described below with reference to FIGS. 16-22B).

In some examples, watch band 212 may include a neuromuscular sensor 215(e.g., an electromyography (EMG) sensor, a mechanomyogram (MMG) sensor,a sonomyography (SMG) sensor, etc.). Neuromuscular sensor 215 may sensea user's muscle intention. Neuromuscular sensor 215 may includeneuromuscular sensor 2110 of FIG. 21A. The sensed muscle intention maybe transmitted to an artificial-reality (AR) system (e.g.,augmented-reality system 1600 of FIG. 16 , virtual-reality system 1700of FIG. 17 , head-mounted display 1902 of FIG. 19 , or augmented-realityglasses 2020 in FIG. 20 ) to perform an action in an associatedartificial-reality environment, such as to control the motion of avirtual device displayed to the user. Further, the artificial-realitysystem may provide haptic feedback to the user in coordination with theartificial-reality application via haptic device 216.

Signals from neuromuscular sensor 215 may be used to provide a user withan enhanced interaction with a physical object and/or a virtual objectin an AR environment generated by an AR system (e.g., augmented-realitysystem 1600 of FIG. 16 , virtual-reality system 1700 of FIG. 17 ,head-mounted display 1902 of FIG. 19 , or augmented-reality glasses 2020in FIG. 20 ). Signals from neuromuscular sensor 215 may be obtained(e.g., sensed and recorded) by one or more neuromuscular sensors 215 ofwatch band 212. Although FIG. 2A shows one neuromuscular sensor 215,watch band 212 may include a plurality of neuromuscular sensors 215arranged circumferentially on an inside surface of watch band 212 suchthat the plurality of neuromuscular sensors 215 contact the skin of theuser. Watch band 212 may include a plurality of neuromuscular sensors215 arranged circumferentially on an inside surface of watch band 212 asshown in wearable system 2100 of FIG. 21A. Neuromuscular sensor 215 maysense and record neuromuscular signals from the user as the userperforms muscular activations (e.g., movements, gestures, etc.). Themuscular activations performed by the user may include static gestures,such as placing the user's hand palm down on a table; dynamic gestures,such as grasping a physical or virtual object; and covert gestures thatare imperceptible to another person, such as slightly tensing a joint byco-contracting opposing muscles or using sub-muscular activations. Themuscular activations performed by the user may include symbolic gestures(e.g., gestures mapped to other gestures, interactions, or commands, forexample, based on a gesture vocabulary that specifies the mapping ofgestures to commands).

An AR system (e.g., the AR systems of FIGS. 16-22B) may operate inconjunction with neuromuscular sensor 215 to overlay one or more visualindicators on or near a physical and/or virtual object within the ARenvironment. The visual indicators may instruct the user that thephysical and/or virtual object (e.g., a sporting object, a gamingobject) is an object that has a set of virtual controls associated withit such that, if the user interacted with the object (e.g., by pickingit up), the user could perform one or more “enhanced” or “augmented”interactions with the object. The visual indicator(s) may indicate thatit is an object capable of enhanced interaction.

In another example, an indication of a set of virtual controls for thephysical or virtual object, which may be activated by the user tocontrol the object, may be overlaid on or displayed near the object inthe AR environment. The user may interact with the indicator(s) of theset of virtual controls by, for example, performing a muscularactivation to select one of the virtual controls. Neuromuscular sensor215 may sense the muscular activation and in response to the interactionof the user with the indicator(s) of the set of virtual controls,information relating to an interaction with the object may bedetermined. For example, if the object is a virtual sword (e.g., a swordused in an AR game), the user may perform a gesture to select thevirtual sword's functionality, such that, when the user picks up thevirtual sword, it may be used to play a game within the AR environment.

Information relating to an interaction of the user with the physicaland/or virtual object may be determined based on the neuromuscularsignals obtained by the neuromuscular sensor 215 and/or informationderived from the neuromuscular signals (e.g., information based onanalog and/or digital processing of the neuromuscular signals).Additionally or alternatively, auxiliary signals from one or moreauxiliary device(s) (e.g., front-facing image sensor 115A, rear-facingimage sensor 115B, IMU 342, microphone 308, heart rate sensor 358, imagesensors of the AR systems of FIGS. 16-22B, etc.) may supplement theneuromuscular signals to determine the information relating to theinteraction of the user with the physical and/or virtual object. Forexample, neuromuscular sensor 215 may determine how tightly the user isgrasping the physical and/or virtual object, and a control signal may besent to the AR system based on an amount of grasping force being appliedto the physical object. Continuing with the example above, the objectmay be a virtual sword, and applying different amounts of graspingand/or swinging force to the virtual sword (e.g., using data gathered bythe IMU 342) may change (e.g., enhance) the functionality of the virtualsword while interacting with a virtual game in the AR environment.

Wristband system 200 may include a coupling mechanism for detachablycoupling watch body 204 to watch band 212. A user may detach watch body204 from watch band 212 in order to reduce the encumbrance of wristbandsystem 200 to the user. Wristband system 200 may include a watch bodycoupling mechanism(s) 206 and/or watch band coupling mechanism(s) 210(e.g., a cradle, a tracker band, a support base, a clasp). Any method orcoupling mechanism may be used for detachably coupling watch body 204 towatch band 212 such as the mechanism described with reference to FIGS.4-14C. A user may perform any type of motion to couple watch body 204 towatch band 212 and to decouple watch body 204 from watch band 212. Forexample, a user may twist, slide, turn, push, pull, or rotate watch body204 relative to watch band 212, or a combination thereof, to attachwatch body 204 to watch band 212 and to detach watch body 204 from watchband 212.

As shown in the example of FIG. 2A, watch band coupling mechanism 210may include a type of frame or shell that allows watch body couplingmechanism 206 to be retained within watch band coupling mechanism 210.Watch body 204 may be detachably coupled to watch band 212 through afriction fit, magnetic coupling, a rotation-based connector, a shear-pincoupler, a retention spring, one or more magnets, a clip, a pin shaft, ahook and loop fastener, or a combination thereof. In some examples,watch body 204 may be decoupled from watch band 212 by actuation ofrelease mechanism 220. Release mechanism 220 may include, withoutlimitation, a button, a knob, a plunger, a handle, a lever, a fastener,a clasp, a dial, a latch, or a combination thereof.

Wristband system 200 may include a single release mechanism 220 ormultiple release mechanisms 220 (e.g., two release mechanisms 220positioned on opposing sides of wristband system 200 such asspring-loaded buttons 403 of FIG. 4 ). As shown in FIG. 2A, releasemechanism 220 may be positioned on watch body 204 and/or watch bandcoupling mechanism 210. Although FIG. 2A shows release mechanism 220positioned at a corner of watch body 204 and at a corner of watch bandcoupling mechanism 210, release mechanism 220 may be positioned anywhereon watch body 204 and/or watch band coupling mechanism 210 that isconvenient for a user of wristband system 200 to actuate. A user ofwristband system 200 may actuate release mechanism 220 by pushing,turning, lifting, depressing, shifting, or performing other actions onrelease mechanism 220. Actuation of release mechanism 220 may release(e.g., decouple) watch body 204 from watch band coupling mechanism 210and watch band 212 allowing the user to use watch body 204 independentlyfrom watch band 212. For example, decoupling watch body 204 from watchband 212 may allow the user to capture images using rear-facing imagesensor 115B.

FIG. 2B is a side view and FIG. 2C is a perspective view of anotherexample wristband system. The wristband systems of FIGS. 2B and 2C mayinclude a watch body interface 230. Watch body 204 may be detachablycoupled to watch body interface 230. Watch body 204 may be detachablycoupled to watch body interface 230 as described in detail withreference to FIGS. 2A and 4-13 . Watch body 204 may be detachablycoupled to watch body interface 230 through a friction fit, magneticcoupling, a rotation-based connector, a shear-pin coupler, a retentionspring, one or more magnets, a clip, a pin shaft, a hook and loopfastener, or a combination thereof.

In some examples, watch body 204 may be decoupled from watch bodyinterface 230 by actuation of a release mechanism. The release mechanismmay include, without limitation, a button, a knob, a plunger, a handle,a lever, a fastener, a clasp, a dial, a latch, or a combination thereof.In some examples, the wristband system functions may be executedindependently in watch body 204, independently in watch body interface230, and/or in communication between watch body 204 and watch bodyinterface 230. Watch body interface 230 may be configured to operateindependently (e.g., execute functions independently) from watch body204. Additionally or alternatively, watch body 204 may be configured tooperate independently (e.g., execute functions independently) from watchbody interface 230. As will be described in more detail below withreference to the block diagram of FIG. 3 , watch body interface 230and/or watch body 204 may each include the independent resourcesrequired to independently execute functions. For example, watch bodyinterface 230 and/or watch body 204 may each include a power source(e.g., a battery), a memory, data storage, a processor (e.g., a CPU),communications, a light source, and/or input/output devices.

In this example, watch body interface 230 may include all of theelectronic components of watch band 212. In additional examples, one ormore electronic components may be housed in watch body interface 230 andone or more other electronic components may be housed in portions ofwatch band 212 away from watch body interface 230.

FIG. 3 is a block diagram of an example wristband system 300, accordingto at least one embodiment of the present disclosure. Referring to FIG.3 , wristband system 300 may have a split architecture (e.g., a splitmechanical architecture, a split electrical architecture) between awatch body 304 and a watch band 312, as discussed above with referenceto FIGS. 1 and 2 . Each of watch body 304 and watch band 312 may have apower source, a processor, a memory, sensors, a charging device, and acommunications device that enables each of watch body 304 and watch band312 to execute computing, controlling, communication, and sensingfunctions independently in watch body 304, independently in watch band312, and/or in communication between watch body 304 and watch band 312.

For example, watch body 304 may include battery 328, CPU 326, storage302, heart rate sensor 358, EMG sensor 346, SpO2 sensor 354, altimeter348, random access memory 303, charging input 330 and communicationdevices NFC 315, LTE 318, and WiFi/Bluetooth™ 320. Similarly, watch band312 may include battery 338, microcontroller unit 352, memory 350, heartrate sensor 358, EMG sensor 346, SpO2 sensor 354, altimeter 348,charging input 334 and wireless transceiver 340. In some examples, alevel of functionality of at least one of watch band 312 or watch body304 may be modified when watch body 304 is detached from watch band 312.The level of functionality that may be modified may include thefunctionality of at least one sensor (e.g., heart rate sensor 358, EMGsensor 346, etc.). Each of watch body 304 and watch band 312 may executeinstructions stored in storage 302 and memory 350 respectively thatenables at least one sensor (e.g., heart rate sensor 358, EMG sensor346, etc.) in watch band 312 to acquire data when watch band 312 isdetached from watch body 304 and when watch band 312 is attached towatch body 304.

Watch body 304 and watch band 312 may further execute instructionsstored in storage 302 and memory 350 respectively that enables watchband 312 to transmit the acquired data to watch body 304 (or an HMD)using wired communications 327 and/or wireless transceiver 340. Asdescribed above with reference to FIGS. 1A and 1B, wristband system 300may include a user interface. For example, watch body 304 may displayvisual content to a user on touchscreen display 313 and play audiocontent on speaker 310. Watch body 304 may receive user inputs such asaudio input from microphone 308 and touch input from buttons 324. Watchbody 304 may also receive inputs associated with a user's locationand/or surroundings. For example, watch body 304 may receive locationinformation from GPS 316 and/or altimeter 348 of watch band 312.

Watch body 304 may receive image data from at least one image sensor 306(e.g., a camera). Image sensor 306 may include front-facing image sensor115A and/or rear-facing image sensor 115B. Front-facing image sensor115A and/or rear-facing image sensor 115B may capture wide-angle imagesof the area surrounding front-facing image sensor 115A and/orrear-facing image sensor 115B such as hemispherical images (e.g., atleast hemispherical, substantially spherical, etc.), 180-degree images,360-degree area images, panoramic images, ultra-wide area images, or acombination thereof. In some examples, front-facing image sensor 115Aand/or rear-facing image sensor 115B may be configured to capture imageshaving a range between 45 degrees and 360 degrees. Certain inputinformation received by watch body 304 (e.g., user inputs, etc.) may becommunicated to watch band 312. Similarly, certain input information(e.g., acquired sensor data, neuromuscular sensor data, etc.) receivedby watch band 312 may be communicated to watch body 304.

Watch body 304 and watch band 312 may receive a charge using a varietyof techniques. In some embodiments, watch body 304 and watch band 312may use a wired charging assembly (e.g., power cords) to receive thecharge. Alternatively or in addition, watch body 304 and/or watch band312 may be configured for wireless charging. For example, a portablecharging device may be designed to mate with a portion of watch body 304and/or watch band 312 and wirelessly deliver usable power to a batteryof watch body 304 and/or watch band 312.

Watch body 304 and watch band 312 may have independent power andcharging sources to enable each to operate independently. Watch body 304and watch band 312 may also share power (e.g., one may charge the other)via power management IC 332 in watch body 304 and power management IC336 in watch band 312. Power management IC 332 and power management IC336 may share power over power and ground conductors and/or overwireless charging antennas.

Wristband system 300 may operate in conjunction with a health monitoringapplication that acquires biometric and activity information associatedwith the user. The health monitoring application may be designed toprovide information to a user that is related to the user's health. Forexample, wristband system 300 may monitor a user's physical activity byacquiring data from IMU 342 while simultaneously monitoring the user'sheart rate via heart rate sensor 358 and saturated blood oxygen levelsvia SpO2 sensor 354. CPU 326 may process the acquired data and displayhealth related information to the user on touchscreen display 313.

Wristband system 300 may detect when watch body 304 and watch band 312are connected to one another (e.g., mechanically connected and/orelectrically connected) or detached from one another. For example,pin(s) 505, power/ground connections 360, wireless transceiver 340,and/or wired communications 327, may detect whether watch body 304 andwatch band 312 are mechanically and/or electrically connected to oneanother (e.g., detecting a disconnect between the one or more electricalcontacts of power/ground connections 360 and/or wired communications327). In some examples, when watch body 304 and watch band 312 aremechanically and/or electrically disconnected from one another (e.g.,watch body 312 has been detached from watch band 312 as described withreference to FIGS. 4-14C), watch body 304 and/or watch band 312 mayoperate with modified level of functionality (e.g., reducedfunctionality) as compared to when watch body 304 and watch band 312 aremechanically and/or electrically connected to one another. The modifiedlevel of functionality (e.g., switching from full functionality toreduced functionality and from reduced functionality to fullfunctionality) may occur automatically (e.g., without user intervention)when wristband system 300 determines that watch body 304 and watch band312 are mechanically and/or electrically disconnected from one anotherand connected to each other, respectively.

Modifying the level of functionality (e.g., reducing the functionalityin watch body 304 and/or watch band 312) may reduce power consumption inbattery 328 and/or battery 338. For example, any of the sensors (e.g.,heart rate sensor 358, EMG sensor 346, SpO2 sensor 354, altimeter 348,etc.), processors (e.g., CPU 326, microcontroller unit 352, etc.),communications elements (e.g., NFC 315, GPS 316, LTE 318,WiFi/Bluetooth™ 320, etc.), or actuators (e.g., haptics 322, 349, etc.)may reduce functionality and/or power consumption (e.g., enter a sleepmode) when watch body 304 and watch band 312 are mechanically and/orelectrically disconnected from one another. Watch body 304 and watchband 312 may return to full functionality when watch body 304 and watchband 312 are mechanically and/or electrically connected to one another.The level of functionality of each of the sensors, processors,actuators, and memory may be independently controlled.

As described above, wristband system 300 may detect when watch body 304and watch band 312 are coupled to one another (e.g., mechanicallyconnected and/or electrically connected) or decoupled from one another.In some examples, watch body 304 may modify a level of functionality(e.g., activate and/or deactivate certain functions) based on whetherwatch body 304 is coupled to watch band 312. For example, CPU 326 mayexecute instructions that detect when watch body 304 and watch band 312are coupled to one another and activate front-facing image sensor 115A.CPU 326 may activate front-facing image sensor 115A based on receivinguser input (e.g., a user touch input from touchscreen display 313, auser voice command from microphone 308, a user gesture recognition inputfrom EMG sensor 346, etc.).

When CPU 326 detects that watch body 304 and watch band 312 aredecoupled from one another, CPU 326 may modify a level of functionality(e.g., activate and/or deactivate additional functions). For example,CPU 326 may detect when watch body 304 and watch band 312 are decoupledfrom one another and activate rear-facing image sensor 115B. CPU 326 mayactivate rear-facing image sensor 115B automatically (e.g., without userinput) and/or based on receiving user input (e.g., a touch input, avoice input, an intention detection, etc.). Automatically activatingrear-facing image sensor 115B may allow a user to take wide-angle imageswithout having to provide user input to activate rear-facing imagesensor 115B.

In some examples, rear-facing image sensor 115B may be activated basedon an image capture criterion (e.g., an image quality, an imageresolution, etc.). For example, rear-facing image sensor 115B mayreceive an image (e.g., a test image). CPU 326 and/or rear-facing imagesensor 115B may analyze the received test image data and determinewhether the test image data satisfies the image capture criterion (e.g.,the image quality exceeds a threshold, the image resolution exceeds athreshold, etc.). Rear-facing image sensor 115B may be activated whenthe test image data satisfies the image capture criterion. Additionallyor alternatively, rear-facing image sensor 115B may be deactivated whenthe test image data fails to satisfy the image capture criterion.

In some examples, CPU 326 may detect when watch body 304 is coupled towatch band 312 and deactivate rear-facing image sensor 115B. CPU 326 maydeactivate rear-facing image sensor 115B automatically (e.g., withoutuser input) and/or based on receiving user input (e.g., a touch input, avoice input, an intention detection, etc.). Deactivating rear-facingimage sensor 115B may automatically (e.g., without user input) reducethe power consumption of watch body 304 and increase the battery chargetime in watch body 304. In some examples, wristband system 300 mayinclude a coupling sensor 307 that senses whether watch body 304 iscoupled to or decoupled from watch band 312. Coupling sensor 307 may beincluded in any of watch body 304, watch band 312, or watch bandcoupling mechanism 210 of FIG. 2A. Coupling sensor 307 (e.g., aproximity sensor) may include, without limitation, an inductiveproximity sensor, a limit switch, an optical proximity sensor, acapacitive proximity sensor, a magnetic proximity sensor, an ultrasonicproximity sensor, or a combination thereof. CPU 326 may detect whenwatch body 304 is coupled to watch band 312 or decoupled from watch band312 by reading the status of coupling sensor 307.

FIG. 4 is a cross-sectional plan view of a detachable wristband system400, according to at least one embodiment of the present disclosure.Wristband system 400 may include watch body 404 that is detachable from,and attachable to, watch band 412. Watch body 404 may detach from watchband 412 by simultaneously pressing buttons 403 inward towards watchband 412 as indicated by direction arrows 409. Buttons 403 may bedisposed on opposite sides of watch body 404 and biased to an outwardposition from watch band 412 by springs 407 (e.g., helical compressionsprings). When spring-loaded buttons 403 are pressed inward, pins 402may retract from an indentation in watch band 412 such that a retainingforce exerted by pins 402 on watch body 404 is removed. The removal ofthe retaining force allows watch body 404 to be easily decoupled fromwatch band 412. In some examples, pins 402 may be spring-loaded andconfigured to retract away from watch band 412 when the retaining forceis removed.

Although FIG. 4 shows four pins 402 that detachably couple watch body404 to watch band 412, the present disclosure is not so limited and anynumber of pins 402 may be used. In some examples, by simultaneouslypressing buttons 403 inward towards watch band 412 as indicated bydirection arrows 409, buttons 403 may exert a force on lock bars 406causing lock bars 406 to shift in position such that pins 402 mayretract from an indentation in watch band 412 and the retaining forceexerted by pins 402 on watch body 404 is removed.

Buttons 403 may include an angled surface disposed adjacent to an angledsurface on lock bars 406. Pressing on buttons 403 in a directionindicated by direction arrows 409 may cause the angled surface ofbuttons 403 to slide along the angled surface of lock bars 406 therebycausing lock bars 406 to laterally shift to align pins 402 withrespective recesses in lock bars 406. Pins 402 may retract from theindentation in watch band 412 and into the respective recesses in lockbars 406. Coupling watch body 404 to watch band 412 may be accomplishedby application of a substantially linear force to watch body 404 towardswatch band 412. An angled (e.g., curved) face of pins 402 may engagewith watch band 412 to cause pins 402 to retract and engage theindentations on watch band 412. When buttons 403 are not pressed,springs 407 may maintain buttons 403 in a retracted position and springs405 may maintain lock bars 406 in a position that applies the retainingforce to pins 402 as described in detail below with reference to FIG. 5.

As described above and shown in FIG. 4 , watch band 412 may includeindentations with which pins 402 of watch body 404 engage to retainwatch body 404 on watch band 412. However, the present disclosure is notlimited to this configuration. In some embodiments, the configurationmay be reversed in that watch body 404 may include indentations andwatch band 412 may include pins 402, lock bars 406, and buttons 403.

FIG. 5 is a detailed cross-sectional view of a wristband couplingmechanism 500, according to at least one embodiment of the presentdisclosure. Wristband coupling mechanism 500 may include watch body 504that is detachable from, and attachable to, watch band 512. FIG. 5 showsa cross section of one of multiple wristband coupling mechanismsdescribed above with reference to FIG. 4 . By simultaneously pressingbuttons (e.g., buttons 403 of FIG. 4 ) inward towards watch band 512,the buttons may exert a force on lock bar 506 causing lock bar 506 toshift in position such that pin 502 may retract from an indentation 511in watch band 512 and the retaining force exerted by pin 502 on watchbody 504 is removed.

In some examples, the geometry of region 513 of indentation 511 may beconfigured such that a net force is created by pin 502 that drives watchband 512 toward watch body 504 (e.g., upward from the perspective ofFIG. 5 ) causing mechanical stability to be maintained between watchband 512 and watch body 504. The contoured surface of pin 502 in region513 may be shaped to create the net force when lock bar 506 exerts aretaining force on pin 502. In some examples, watch band 512 and watchbody 504 may have complementary electrical contacts (e.g., pogo pincontacts or pin 502) to allow electrical power and/or signals to passbetween watch band 512 and watch body 504 as described above withreference to FIG. 3 . In addition to providing mechanical stability, thenet force created by pin 502 may maintain the integrity of theelectrical contacts between watch band 512 and watch body 504.

FIG. 6 is a perspective view of coupling mechanism 600, according to atleast one embodiment of the present disclosure. Coupling mechanism 600may be part of a watch band that is detachably coupled to a watch body.For example, coupling mechanism 600 may be watch band coupling mechanism210 of FIG. 2A that detachably couples watch body 204 to watch band 212.A watch body may be coupled to coupling mechanism 600 by applying asubstantially linear force on the watch body towards coupling mechanism600 (e.g., downward in the perspective of FIG. 6 ) such that at leastone spring loaded pawl on the watch body engages lock surfaces 602 and604 of coupling mechanism 600.

Coupling mechanism 600 may include at least one lock surface 602 thatprevents rotation of the watch body when the watch body is coupled tothe watch band. Coupling mechanism 600 may include at least one verticallock surface 604 that prevents vertical movement of the watch bodyrelative to coupling mechanism 600 when the watch body is coupled to thewatch band. In some examples, coupling mechanism 600 may include onelock surface 602 to prevent rotational movement and three vertical locksurfaces 604 arranged in a plane to prevent vertical movement.

A watch body may be decoupled from coupling mechanism 600 by applying arotational force to the watch body such that the at least one springloaded pawl on the watch body disengages from lock surfaces 602 and 604of coupling mechanism 600. In some examples, the watch body may bedecoupled from coupling mechanism 600 by actuation of release mechanism620. Release mechanism 620 may include, without limitation, a button, aknob, a plunger, a handle, a lever, a fastener, a clasp, a dial, alatch, or a combination thereof. Coupling mechanism 600 may include asingle release mechanism 620 or multiple release mechanisms 620 (e.g.,two release mechanisms 620 positioned on opposing corners of couplingmechanism 600).

Although FIG. 6 shows release mechanism 620 positioned at a corner ofcoupling mechanism 600, release mechanism 620 may be positioned anywhereon coupling mechanism 600 that is convenient for a user to actuate. Auser may actuate release mechanism 620 by pushing, turning, lifting,depressing, shifting, or performing other actions on release mechanism620. Actuation of release mechanism 620 may release (e.g., decouple) thewatch body from coupling mechanism 600 allowing the user to use thewatch body independently from coupling mechanism 600 and the watch band.

Coupling mechanism 600 may include ramp surfaces (e.g., taperedsurfaces) in the corners of coupling mechanism 600 to aid in thecoupling. For example, ramp surface 613 is shown in FIG. 6 in one cornerof coupling mechanism 600. Each of the corners of coupling mechanism 600may include ramp surface 613. Additionally or alternatively, couplingmechanism 600 may include slots in the corners of coupling mechanism 600to aid in the rotational decoupling of the watch body from the watchband. For example, coupling mechanism 600 may include two slots 615 ineach corner of coupling mechanism 600. Slots 615 may include one enddisposed next to lock surface 602 and/or 604.

Slots 615 may be angled away from lock surface 602 and/or 604 such thata rotating motion (e.g., a twisting motion) of the watch body relativeto coupling mechanism 600 allows the watch body to be rotated offcoupling mechanism 600 in either a clockwise or counterclockwisedirection. Slots 615 may be angled as they extend away from lock surface602 and/or 604 at an angle 603. Angle 603 may be defined as an anglefrom a bottom plane of the coupling mechanism 600. Angle 603 may beconfigured to allow the watch body to be rotated smoothly off couplingmechanism 600 in either a clockwise or counterclockwise direction. Forexample, angle 603 may be between about 5 degrees and about 30 degrees,such as between about 10 degrees and 20 degrees (e.g., about 10 degrees,about 12 degrees, about 14 degrees, about 16 degrees, about 18 degrees,or about 20 degrees). In some examples, slots 615 may have a length suchthat rotation of the watch body may cause the watch body to be detachedfrom the coupling mechanism 600 when a pin of the watch body reaches anend of slots 615.

For example, rotation of the watch body in either a clockwise orcounterclockwise direction by an angle 605 may cause the pin to reachthe end of slots 615 and watch body to be detached from the couplingmechanism 600. Angle 605 may be between about 5 degrees and about 30degrees, such as between about 10 degrees and about 20 degrees (e.g.,about 10 degrees, about 12 degrees, about 14 degrees, about 16 degrees,about 18 degrees, or about 20 degrees). The mechanisms and methods forcoupling and decoupling the watch body to coupling mechanism 600 will bedescribed in more detail below with reference to FIGS. 7 and 8 .

FIG. 7 is a cross-sectional view of a wristband coupling mechanism 700that prevents vertical movement, according to at least one embodiment ofthe present disclosure. FIG. 7 shows watch body 704 coupled to watchband 712. Watch body 704 may be coupled to watch band 712 by applying asubstantially linear force to watch body 704 towards watch band 712 suchthat spring-loaded pawl 707 on watch body 704 engages vertical locksurface 706. When watch body 704 is coupled to watch band 712, verticallock surface 706 may prevent vertical movement, as indicated bydirection arrow 709, of watch body 704 relative to watch band 712.Spring 710 (e.g., a helical compression spring, a leaf spring, or atorsion spring) may exert a radially-outward force on pawl 707 towardsvertical lock surface 706 such that an angled surface disposed on anupper end of pawl 707 is configured to engage vertical lock surface 706to secure watch body 704 to the watch band in a linear direction (e.g.,a vertical direction).

When coupling watch body 704 to watch band 712, a substantially linearforce may be applied to watch body 704 towards watch band 712 causingpawl 707 to initially contact ramp surface 713. Spring 710 may becompressed radially inward and pawl 707 may travel inward until pawl 707contacts vertical lock surface 706 and secures watch band 712 to watchbody 704. When decoupling watch body 704 from watch band 712, a rotatingmotion (e.g., a twisting motion) is applied to watch body 704 relativeto watch band 712 causing an upper end of pawl 707 to travel in anangled slot (e.g., slot 615 of FIG. 6 ) such that pawl 707 becomesdisengaged from vertical lock surface 706. Thus, the rotating motion mayallow watch body 704 to be rotated off watch band 712 in either aclockwise or counterclockwise direction.

As explained above, watch body 704 may be secured to watch band 712 viapawl 707 and spring 710. However, this disclosure is not limited to thissecuring mechanism. For example, in additional embodiments, watch body704 may be at least partially secured to watch band 712 with one or moremagnets as described below with reference to FIGS. 9-13 . In someexamples, magnets may be used in addition to pawl 707 and spring 710 toincrease a force by which watch body 704 is secured to watch band 712when engaged.

FIG. 8 is a cross-sectional view of a wristband coupling mechanism 800that inhibits rotational movement between watch body 804 and watch band812, according to at least one embodiment of the present disclosure.FIG. 8 shows watch body 804 coupled to watch band 812. Watch body 804may be coupled to watch band 812 by applying a substantially linearforce to watch body 804 towards watch band 812 such that spring-loadedpawl 807 engages rotational lock surface 806. When watch body 804 iscoupled to watch band 812, rotational lock surface 806 may inhibitrotational movement, as indicated by direction arrow 809, of watch body804 relative to watch band 812. Spring 810 (e.g., a torsion spring) mayexert a radially outward force on pawl 807 towards rotational locksurface 806 such that an angled (e.g., contoured) surface disposed on anupper end of pawl 807 engages rotational lock surface 806 to securewatch body 804 to watch band 812 in a rotational direction.

When coupling watch body 804 to watch band 812, a substantially linearforce may be applied to watch body 804 towards watch band 812 causingpawl 807 to contact a ramp surface (e.g., such as ramp surface 613 ofFIG. 6 ) such that spring 810 is compressed radially inward and pawl 807travels inward until pawl 807 contacts rotational lock surface 806 andsecures watch band 812 to watch body 804. In other words, watch body 804may be coupled to watch band 812 by linearly pushing watch body 804 downinto engagement with watch band 812 with or without rotation of watchbody 804 relative to watch band 812. When decoupling watch body 804 fromwatch band 812, a rotating force (e.g., a twisting force) may be appliedto watch body 804 relative to watch body 804 to overcome a spring forcefrom spring 810, causing pawl 807 to retract away from rotational locksurface 806. An upper end of pawl 807 may travel in an angled slot(e.g., such as slot 615 of FIG. 6 ) such that the rotating motion allowswatch body 804 to be rotated off watch band 812 in either a clockwise orcounterclockwise direction.

Watch body 804 may have a shape that is complementary to watch band 812.For example, watch body 804 and watch band 812 may each be substantiallyrectangular, square, circular, hexagonal, octagonal, rectangular withrounded corners (as illustrated in FIG. 8 ), or any other suitableshape.

FIG. 9 is a bottom perspective view of a bottom portion of watch body904 uncoupled from a watch band, according to at least one embodiment ofthe present disclosure. FIG. 10 is a top perspective view of a watchband 1012 to which watch body 904 of FIG. 9 may be coupled or uncoupled,according to at least one embodiment of the present disclosure. Watchbody 904 may be coupled and/or uncoupled from watch band 1012 using anytype motion and/or mechanism. For example, watch body 904 may be coupledto and/or uncoupled from watch band 1012 by applying a twisting motion,a linear motion, a turning motion, a shaking motion, a bending motion, apushing motion, a pulling motion, a helical motion, or a combinationthereof. In some examples, watch body 904 may be coupled and/oruncoupled from watch band 1012 using a sequence of the aforementionedmotions. For example, watch body 904 may couple to and/or uncouple fromwatch band 1012 by a twisting motion of watch body 904 relative to watchband 1012. For example, a user may place watch body 904 proximate towatch band 1012. At least one watch body magnet 960 may be attracted toa watch band magnet 1060 when watch body 904 is close to watch band 1012(e.g., when the center of watch body 904 is placed approximately on topof the center of watch band 1012). The attraction between watch bodymagnet 960 and watch band magnet 1060 may align watch body 904 to apre-couple position relative to watch band 1012. The pre-couple positionof watch body 904 to watch band 1012 may be a position in which acoupling mechanism between watch body 904 and watch band 1012 ispre-engaged. In some examples, the attraction between watch body magnet960 and watch band magnet 1060 may couple (e.g., secure) watch body 904to watch band 1012.

Subsequent to the pre-coupled alignment of watch body 904 to watch band1012, the user may rotate watch body 904 relative to watch band 1012 inorder to couple watch body 904 to watch band 1012. For example, the usermay rotate watch body 904 in a clockwise direction as described indetail below with reference to FIGS. 11 and 12 . In some examples, theuser may rotate watch body 904 relative to watch band 1012 in aclockwise direction by less than 5 degrees, by about 5 degrees to 10degrees, by about 10 degrees to 15 degrees, or by more than 15 degrees.As described in detail below with reference to FIGS. 11-13 , latch pin928 may be configured to engage a recess 1072 (e.g., a hole, a slot) inwatch band 1012 to inhibit movement of watch body 904 when watch body904 is coupled to watch band 1012.

In some examples, watch body 904 may be decoupled from watch band 1012by applying a rotational force to watch body 904 while pressing a button920. Pressing button 920 may actuate a push-button decoupling mechanism(e.g., push-button decoupling mechanism 1100 as described in detailbelow with reference to FIG. 11 ) allowing watch body 904 to rotate offof watch band 1012. In some examples, a sensor 914 (e.g., a proximitysensor, a heart rate monitor sensor) may be configured to sense whenwatch body 904 is decoupled from watch band 1012. A processor (e.g., CPU326 of FIG. 3 ) of watch body 904 may be configured to detect thedecoupled status and modify a function of watch body 904. For example,the processor may execute instructions to enable an image sensor (e.g.,rear-facing image sensor 915) and/or change a power consumption settingwhen watch body 904 is decoupled from watch band 1012. Additionally oralternatively, a processor of watch body 904 may be configured to detecta coupled status and execute instructions to disable rear-facing imagesensor 915 and/or change a power consumption setting.

In some examples, button 920 may also be used to couple watch body 904to watch band 1012. For example, a user may press button 920 to enablewatch body 904 to shift into the pre-coupled position in which watchbody magnet 960 is aligned with watch band magnet 1060. As the usertwists watch body 904 from the pre-coupled position to the coupledposition, the user may release button 920 to enable latch pin 928 toengage recess 1072 of watch band 1012. In some examples, watch band 1012may include a latching mechanism and watch body 904 may include a recessconfigured to accept a latch pin disposed on watch band 1012.

FIG. 11 is a perspective view of a bottom portion of a watch body 1104uncoupled from a watch band 1112, according to at least one additionalembodiment of the present disclosure. Watch body 1104 may couple toand/or uncouple from watch band 1112 by a twisting motion of watch body1104 relative to watch band 1112. For example, to couple watch body 1104to watch band 1112, a user may place watch body 1104 on top of watchband 1112. At least one watch body magnet 1160 may be attracted to atleast one watch band magnet 1162 when the center of watch body 1104 isplaced approximately on top of the center of watch band 1112. Theattraction between watch body magnet(s) 1160 and watch band magnet(s)1162 may align watch body 1104 to a pre-coupled position relative towatch band 1112. After aligning watch body 1104 to watch band 1112 tothe pre-coupled position, the user may rotate watch body 1104 relativeto watch band 1112 in order to couple watch body 1104 to watch band1112.

In some examples, a tab 1174 of watch body 1104 may be configured totravel along a slot 1165 of watch band 1112 thereby drawing watch body1104 closer to watch band 1112 and into a coupled position. AlthoughFIG. 11 shows two sets of tabs 1174 and slots 1165 disposed in oppositecorners, the present disclosure is not so limited and any number of setsof tabs 1174 and slots 1165 may be used. For example, each corner mayinclude a set of tabs 1174 and slots 1165 or only one corner may includea set of tabs 1174 and slots 1165. The user may rotate watch body 1104relative to the watch band in a clockwise direction as indicated bydirection arrow 1168. In some examples, the user may rotate watch body1104 relative to the watch band in a clockwise direction by less than 5degrees, by about 5 degrees to 10 degrees, by about 10 degrees to 15degrees, or by more than 15 degrees. Although FIG. 11 shows watch body1104 coupling to watch band 1112 by a clockwise twisting motion, thepresent disclosure is not so limited and watch body 1104 may couple towatch band 1112 by a counter-clockwise twisting motion as indicated bydirection arrow 1168.

As described in detail below with reference to FIG. 13 , a latch pin1128 may be configured to engage a recess 1172 (e.g., a hole, a slot) inwatch band 1112 to inhibit movement of watch body 1104 when watch body1104 is coupled to watch band 1112.

In some examples, watch body 1104 may be decoupled from watch band 1112by twisting watch body 1104 in a counterclockwise direction (orclockwise direction) as indicated by direction arrow 1168 while a buttonis depressed on watch band 1104. Pressing a button may actuate apush-button decoupling mechanism (e.g., push-button decoupling mechanism1100 of FIG. 11 ) allowing watch body 1104 to rotate off of watch band1112. In additional embodiments, latch pin 1128 may be spring-biasedinto a coupled position and a decoupling button may be omitted. In thiscase, the user may decouple watch body 1104 from watch band 1112 bytwisting watch body 1104 in a counterclockwise direction relative towatch band 1112 with sufficient force to overcome a spring force biasingthe latch pin 1128 into the coupled position.

FIG. 12 is a detailed perspective view of a portion of a watch band 1212configured with a receiver 1265. As described above with reference toFIGS. 9-11 , when an attraction between magnets disposed in watch band1212 and a watch body aligns the watch body to a pre-coupled positionrelative to watch band 1212, a tab disposed on the watch body (e.g., tab1174 of FIG. 11 ) may be aligned with an entry region 1280 of receiver1265. By rotating the watch body in an engaging direction (e.g., aclockwise direction), as indicated by direction arrow 1268, when thewatch body tab is aligned with entry region 1280, the watch body tab maybe configured to travel along a ramp surface 1273 (e.g., a taperedsurface) in receiver 1265 thereby drawing the watch body closer to watchband 1212. The watch body may be rotated relative to watch band 1212 toa point at which the watch body tab reaches ramp surface end stop 1275preventing further rotation of the watch body. When the watch body tabreaches end stop 1275, a rounded corner of the watch body tab may abutagainst a rounded corner 1274 of ramp surface 1273. When the watch bodytab reaches end stop 1275 preventing further rotation of the watch body,a latch pin on the watch body (e.g., latch pin 1328 of FIG. 13 ) may bealigned with recess 1272. The watch body may be rotated relative towatch band 1212 to a point at which a latch pin is aligned andconfigured to engage recess 1272 (e.g., a hole, an indentation) in watchband 1212. The latch pin (e.g., latch pin 1328 of FIG. 13 ) may beconfigured to secure the watch body to watch band 1212.

Ramp surface 1273 may be angled such that a rotating motion (e.g., atwisting motion) of the watch body relative to watch band 1212 allowsthe watch body to be rotated off watch band 1212 in a counterclockwisedirection as indicated by direction arrow 1268. Ramp surface 1273 may beconfigure at an angle 1203. Angle 1203 may be defined as an angle oframp surface 1273 relative to a bottom plane of watch band 1212. Angle1203 may be configured to allow the watch body to be rotated smoothlyoff watch band 1212 in a counterclockwise direction.

Although FIG. 12 shows watch band 1212 configured to allow the watchbody to couple to watch band 1212 through a clockwise rotation anduncouple through a counterclockwise direction, the present disclosure isnot so limited and watch band 1212 may be configured to allow the watchbody to couple to watch band 1212 through a counterclockwise rotationand uncouple through a clockwise direction. In some examples, angle 1203may be between about 5 degrees and about 30 degrees, such as betweenabout 10 degrees and 20 degrees (e.g., about 10 degrees, about 12degrees, about 14 degrees, about 16 degrees, about 18 degrees, or about20 degrees). In some examples, ramp surface 1273 may have a length suchthat rotation of the watch body may cause the watch body to be detachedfrom watch band 1212 when a latch pin of the watch body leaves entryregion 1280.

FIG. 13 is a cross-sectional view of a push-button decoupling mechanism1300, according to at least one embodiment of the present disclosure. Asdescribed above with reference to FIGS. 9-12 , watch body 1304 maydecouple (e.g., physically detach) from watch band 1312 by rotatingwatch body 1304 relative to watch band 1312. In some embodiments, watchbody 1304 may be configured to decouple from watch band 1312 by a userpressing button 1320 and rotating watch body 1304 relative to watch band1312. Push-button decoupling mechanism 1300 may include button 1320configured to travel within a recessed area 1321 of watch body 1304. Insome examples, the mechanism used to couple and/or decouple watch band1312 and watch body 1304 may include a latch, a clip, a bar, a bolt, ahasp, a snap, a pin, a spring, a cam, a clamp, a strap, a wedge, a hook,or a combination thereof. In some examples, an O-ring 1322 may surrounda shaft of button 1320 and be sized and configured to protect watch body1304 from ingression of foreign material (e.g., water, dust, hair,etc.).

Push-button decoupling mechanism 1300 may include a lever 1326configured to pivot about axis 1327. A distal portion of the shaft ofbutton 1320 may contact a middle region 1338 of lever 1326. When button1320 is pressed in a direction indicated by arrow 1319, the shaftcontacting middle region 1338 of lever 1326 may cause lever 1326 topivot about axis 1327 in a counterclockwise direction (from the view ofFIG. 13 ). When lever 1326 pivots about axis 1327, a lower region oflever 1326 may also pivot in a counterclockwise direction. When lever1326 pivots counterclockwise due to button 1320 being pressed, a bottomregion of lever 1326 may press against a top region of latch pin lever1341 causing latch pin 1328 to pivot in a clockwise direction (from theview of FIG. 13 ) about latch axis 1340. When latch pin 1328 pivots in aclockwise direction about latch axis 1340 as indicated by directionarrow 1368, a bottom region of latch pin 1328 may travel in a directionindicated by arrow 1342 and withdraw from a recessed area within watchband 1312.

When the bottom region of latch pin 1328 is extended into the recessedarea within watch band 1312, latch pin 1328 may be configured to securewatch body 1304 to watch band 1312. In some examples, watch body 1304may include multiple push-button decoupling mechanisms 1300. In someexamples, an O-ring 1323 may surround a shaft of latch pin 1328 and besized and configured to protect watch body 1304 from ingression offoreign material (e.g., water, dust, hair, etc.).

Push-button decoupling mechanism 1300 may include a spring 1336 (e.g., atorsion spring, a helical compression spring, a leaf spring, etc.).Spring 1336 may be configured to rotate about axis 1340 and exert aforce on latch pin 1328 in a direction opposite to the directionindicated by arrow 1342. Spring 1336 may be configured to exert a forceon latch pin lever 1341 which may be transferred to latch pin 1328 suchthat the bottom region of latch pin 1328 is extended into the recessedarea thereby retaining the coupling between watch body 1304 and watchband 1312. The force exerted on latch pin lever 1341 may be transferredto the bottom region of lever 1326 due to the upper region of latch pin1328 overlapping the bottom region of lever 1326. The force transferredto the bottom region of lever 1326 may be transferred to the contactarea between the middle region of lever 1326 and the shaft of button1320 causing button 1320 to move to an extended position (e.g., notdepressed). A retaining clip 1324 may be configured to limit the extendtravel length of button 1320 and retain the shaft of button 1320 withinwatch body 1304.

Watch body 1304 may be configured to decouple from watch band 1312 by auser pressing button 1320 and rotating watch body 1304 relative to watchband 1312. By pressing button 1320, push-button decoupling mechanism1300 may retract latch pin 1328 from a recess in watch band 1312allowing a user to twist watch body 1304 off watch band 1312.

In some examples, button 1320 may be configured as a multi-functionbutton. For example, button 1320 may be configured to retract latch pin1328 from a recess in watch band 1312. Additionally or alternatively,button 1320 may be configured to enable and/or disable a function ofwatch body 1304. Button 1320 may be configured to sense a user pressingbutton 1320 and provide the status of the button 1320 (e.g., pressed ornot pressed) to a processor (e.g., CPU 326 of FIG. 3 ). The processormay execute instructions to enable and/or disable a function of watchbody 1304 based on the status of button 1320. For example, a userpressing button 1320 may be sensed by the processor. In response, theprocessor may execute instructions to capture an image (e.g., capture animage using front-facing image sensor 115A of FIG. 1 ).

In some examples, the multi-function capabilities of button 1320 may bebased on a travel length of button 1320. For example, when button 1320is not pressed and is fully extended, button 1320 may enable latch pin1328 to remain extended into a recess in watch band 1312 therebysecuring watch body 1304 to watch band 1312. When button 1320 is pressedthrough a first travel length, button 1320 may be configured to providethe status of the button press to a processor in order to execute afunction. In some examples, the first travel length may be about 0.1 mm,about 0.2 mm, about 0.3 mm, or more. When button 1320 is pressed througha second travel length, button 1320 may be configured to retract latchpin 1328 from a recess in watch band 1312 allowing a user to twist watchbody 1304 off watch band 1312. The second travel length may be about 0.2mm, about 0.3 mm, about 0.4 mm, about 0.5 mm, or more.

In some examples, the second travel length may be longer than the firsttravel length. When pressing button 1320, a user may feel a first levelof force pushing back on the user's finger (e.g., force feedback) as thebutton 1320 is pressed through the first travel length. As the usercontinues to press button 1320 the user may feel an increased force toindicate that the first travel length has been traveled and the secondtravel length is beginning. This force feedback may allow the user tocontrol the travel lengths of button 1320 and therefore control theassociated functions.

FIG. 14A is a top plan view of a watch band 1412, according to at leastone embodiment of the present disclosure. Watch band 1412 (e.g., a watchcradle) may be worn on a wrist of a user. As described above withreference to FIGS. 9-13 , watch band 1412 may couple to a watch body ina variety of ways. When coupling a watch body to watch band 1412,foreign material (e.g., arm hair of the user) may be disposed at theinterface between the watch body and watch band 1412. Embodiments of thepresent disclosure may inhibit (e.g., prevent and/or reduce) a trappingof the foreign material at the interface between the watch body andwatch band 1412. For example, watch band 1412 may be configured toinclude a spacing gap between the watch body and watch band 1412 toprevent a user's arm hair from being trapped (e.g., pinched) at theinterface between the watch body and watch band 1412, thereby preventinguser discomfort.

Watch band 1412 may include a first profile 1432 between watch band 1412and the watch body along an inside perimeter edge (e.g., bottom sideperimeter edge) of watch band 1412. The watch body and watch band 1412may not be in contact with each other along the first profile when thewatch body is coupled to watch band 1412. Watch band 1412 may alsoinclude a second profile 1430 between watch band 1412 and the watch bodyalong an inside perimeter edge, on the opposite side (e.g., top side) ofwatch band 1412 that includes first profile 1432. The watch body andwatch band 1412 may be in contact with each other along at least aportion of the second profile when the watch body is coupled to watchband 1412.

In some embodiments, first profile 1432 may be concentric (e.g., mayhave a same shape) relative to an adjacent surface of the watch bodycoupled to watch band 1412. In contrast, second profile 1430 may benon-concentric (e.g., may have a different shape) relative to anadjacent surface of the watch body coupled to watch band 1412. Forexample, second profile 1430 may have one or more inward protrusionsthat may abut against the watch body when the watch body is coupled towatch band 1412.

FIG. 14B shows a cross-sectional view of watch band 1412 across cuttingplane A-A of FIG. 14A. As shown with reference to FIG. 14B, firstprofile 1432 may be sized and configured such that a substantiallyuniform spacing gap 1452 is created between watch body 1404 and watchband 1412 around the entire perimeter of watch band 1412. Spacing gap1452 may have a width of about 0.1 mm, about 0.2 mm, about 0.3 mm, about0.4 mm, or more. Spacing gap 1452 disposed between watch body 1404 andwatch band 1412 may be sized and configured to prevent a user's arm hairfrom being trapped (e.g., pinched) at the interface between watch body1404 and watch band 1412.

FIG. 14C shows a cross-sectional view of watch band 1412 across cuttingplane B-B of FIG. 14A. As shown with reference to FIG. 14C, secondprofile 1430 may be sized and configured such that a non-uniform spacinggap 1450 is created between watch body 1404 and watch band 1412 aroundthe entire perimeter of watch band 1412. Spacing gap 1450 may be smallerin certain regions of second profile 1430 than in other regions. Forexample, spacing gap 1450 may be 0 mm (e.g., no gap) in corner regions1460 where one or more inward protrusions may be present. At cornerregions 1460, watch body 1404 and watch band 1412 may contact oneanother when watch body 1404 is coupled to watch band 1412.

By configuring watch body 1404 to contact watch band 1412 in cornerregions 1460, the mechanical stability of the watch assembly (e.g.,watch body 1404 coupled to watch band 1412) may be increased. In regionsof second profile 1430 other than corner regions 1460 (e.g., the sideregions), spacing gap 1450 may have a width of about 0.1 mm, about 0.2mm, about 0.3 mm, about 0.4 mm, or more. Spacing gap 1450 between watchbody 1404 and watch band 1412 in regions of second profile 1430 otherthan corner regions 1460 may be configured to prevent a user's arm hairfrom being trapped (e.g., pinched) at the interface between watch body1404 and watch band 1412.

FIG. 15 is a flow diagram illustrating an example method 1500 ofoffloading a computing task from a head-mounted display to a watch body.At operation 1510, method 1500 may include determining at least onecomputing task of a head-mounted display (HMD) that is suitable forprocessing on available computing resources of a watch body. Operation1510 may be performed in a variety of ways, as will be understood by oneskilled in the art considering the present disclosure. The offloadedcomputing task may be determined based on computing requirements, powerconsumption, latency requirements, or a combination thereof.

At operation 1520, method 1500 may include selectively offloading the atleast one computing task of the HMD that is suitable for processing onthe available computing resources of the watch body to the watch body.Operation 1520 may be performed in a variety of ways. For example, thetask offloaded from the HMD to the watch body may include an imageprocessing task. Sensors (e.g., image sensors) of the HMD may acquiredata that captures images surrounding the HMD. The images may includecertain features and/or objects (e.g., people, faces, devices,backgrounds, etc.) of the captured image. The watch body may processthese images to subtract, add, and/or enhance the objects beforedisplaying on the HMD and/or a display of the watch body (e.g., displayscreen 102). In some examples, offloading computing tasks from the HMDto the wristband system may reduce power consumption and/or decreasecomputing task execution latency in the HMD.

In some examples, the task offloaded from the HMD to the watch body mayinclude a location determining task. Sensors (e.g., LiDAR sensors, radarsensors) and/or receivers (e.g., RF receivers, WiFi receivers, GPSreceivers) of the HMD may acquire data that requires processing (e.g.,triangulation) in order to determine the location, orientation, and/orposition of an object relative to the HMD (e.g., a 3D location of theHMD relative to the watch body). The data acquired by the HMD may betransmitted to the watch body for processing. The watch body may executethe location determining task by processing the data and returning theresultant location of the object to the HMD. In some examples, the taskoffloaded from the HMD to the watch body may include a neural networkprocessing task. For example, data acquired by sensors of the HMD (e.g.,neuromuscular sensors disposed on a surface of an HMD strap contactingthe user's head) may require processing in order to train a neuralnetwork (e.g., a recurrent neural network, a long short term memorynetwork, a convolutional neural network) to accurately predict an event.The data acquired by the HMD may be transmitted to the watch body forprocessing. The watch body may train the neural network using theacquired and return a trained model to the HMD.

In some examples, the task offloaded from the HMD to the watch body mayinclude a graphics processing task. For example, graphics data of anartificial-reality application (e.g., a gaming application) running onthe HMD may require processing in order to properly render on the HMD.At least a portion of the graphics data may be transmitted to the watchbody for processing. The watch body may process the graphics data (e.g.,execute a rendering algorithm) and return the processed graphics data tothe HMD and/or display an image based on the processed graphics data ona display of the watch body (e.g., display screen 102).

At operation 1530, method 1500 may include processing, by the availablecomputing resources of the watch body, the at least one computing task.Operation 1530 may be performed in a variety of ways. For example, theat least one computing task may be performed using processor(s) andmemory of the watch body such as those described above with reference toFIG. 3 .

At operation 1540, method 1500 may include sending results of theprocessed at least one computing task to the HMD. For example, the watchband may transmit the results to the HMD using a wireless communicationmethod.

As described in detail above, the present disclosure details systems,devices, and methods related to a wristband system that includes a watchbody that detachably couples to a watch band. The watch body maydecouple from the watch band in order to reduce an encumbrance to a userwearing the watch band. The wristband system may have a splitarchitecture that allows the watch band and the watch body to operateboth independently and in communication with one another. For example,the watch band may independently acquire sensor data (e.g.,neuromuscular sensor data) when the watch body is detached and transmitthat data to the watch body. The mechanical architecture may include acoupling mechanism on the watch band and/or the watch body that allows auser to conveniently attach and detach the watch body from the watchband. The watch body may modify a function based on whether the watchbody is coupled or decoupled from the watch band.

In some embodiments, one or more objects (e.g., data associated withsensors, and/or activity information) of a computing system may beassociated with one or more privacy settings. These objects may bestored on or otherwise associated with any suitable computing system orapplication, such as, for example, a social-networking system, a clientsystem, a third-party system, a messaging application, a photo-sharingapplication, a biometric data acquisition application, anartificial-reality application, and/or any other suitable computingsystem or application.

Privacy settings (or “access settings”) for an object may be stored inany suitable manner; such as, for example, in association with theobject, in an index on an authorization server, in another suitablemanner, or any suitable combination thereof. A privacy setting for anobject may specify how the object (or particular information associatedwith the object) can be accessed, stored, or otherwise used (e.g.,viewed, shared, modified, copied, executed, surfaced, or identified)within an application (such as an artificial-reality application). Whenprivacy settings for an object allow a particular user or other entityto access that object, the object may be described as being “visible”with respect to that user or other entity. As an example, a user of anartificial-reality application may specify privacy settings for auser-profile page that identify a set of users that may access theartificial-reality application information on the user-profile page,thus excluding other users from accessing that information. As anotherexample, an artificial-reality application may store privacypolicies/guidelines. The privacy policies/guidelines may specify whatinformation of users may be accessible by which entities and/or by whichprocesses (e.g., internal research, advertising algorithms,machine-learning algorithms), thus ensuring only certain information ofthe user may be accessed by certain entities or processes.

In some embodiments, privacy settings for an object may specify a“blocked list” of users or other entities that should not be allowed toaccess certain information associated with the object. In some cases,the blocked list may include third-party entities. The blocked list mayspecify one or more users or entities for which an object is notvisible.

Privacy settings associated with an object may specify any suitablegranularity of permitted access or denial of access. As an example,access or denial of access may be specified for particular users (e.g.,only me, my roommates, my boss), users within a particulardegree-of-separation (e.g., friends, friends-of-friends), user groups(e.g., the gaming club, my family), user networks (e.g., employees ofparticular employers, students or alumni of particular university), allusers (“public”), no users (“private”), users of third-party systems,particular applications (e.g., third-party applications, externalwebsites), other suitable entities, or any suitable combination thereof.In some embodiments, different objects of the same type associated witha user may have different privacy settings. In addition, one or moredefault privacy settings may be set for each object of a particularobject-type.

Embodiments of the present disclosure may include or be implemented inconjunction with various types of artificial-reality systems. Artificialreality is a form of reality that has been adjusted in some mannerbefore presentation to a user, which may include, for example, a virtualreality, an augmented reality, a mixed reality, a hybrid reality, orsome combination and/or derivative thereof. Artificial-reality contentmay include completely computer-generated content or computer-generatedcontent combined with captured (e.g., real-world) content. Theartificial-reality content may include video, audio, haptic feedback, orsome combination thereof, any of which may be presented in a singlechannel or in multiple channels (such as stereo video that produces athree-dimensional (3D) effect to the viewer). Additionally, in someembodiments, artificial reality may also be associated withapplications, products, accessories, services, or some combinationthereof, that are used to, for example, create content in an artificialreality and/or are otherwise used in (e.g., to perform activities in) anartificial reality.

Artificial-reality systems may be implemented in a variety of differentform factors and configurations. Some artificial-reality systems may bedesigned to work without near-eye displays (NEDs). Otherartificial-reality systems may include an NED that also providesvisibility into the real world (such as, e.g., augmented-reality system1600 in FIG. 16 ) or that visually immerses a user in an artificialreality (such as, e.g., virtual-reality system 1700 in FIG. 17). Whilesome artificial-reality devices may be self-contained systems, otherartificial-reality devices may communicate and/or coordinate withexternal devices to provide an artificial-reality experience to a user.Examples of such external devices include handheld controllers, mobiledevices, desktop computers, devices worn by a user, devices worn by oneor more other users, and/or any other suitable external system.

Turning to FIG. 16 , augmented-reality system 1600 may include aneyewear device 1602 with a frame 1610 configured to hold a left displaydevice 1615(A) and a right display device 1615(B) in front of a user'seyes. Display devices 1615(A) and 1615(B) may act together orindependently to present an image or series of images to a user. Whileaugmented-reality system 1600 includes two displays, embodiments of thisdisclosure may be implemented in augmented-reality systems with a singleNED or more than two NEDs.

In some embodiments, augmented-reality system 1600 may include one ormore sensors, such as sensor 1640. Sensor 1640 may generate measurementsignals in response to motion of augmented-reality system 1600 and maybe located on substantially any portion of frame 1610. Sensor 1640 mayrepresent one or more of a variety of different sensing mechanisms, suchas a position sensor, an inertial measurement unit (IMU), a depth cameraassembly, a structured light emitter and/or detector, or any combinationthereof. In some embodiments, augmented-reality system 1600 may or maynot include sensor 1640 or may include more than one sensor. Inembodiments in which sensor 1640 includes an IMU, the IMU may generatecalibration data based on measurement signals from sensor 1640. Examplesof sensor 1640 may include, without limitation, accelerometers,gyroscopes, magnetometers, other suitable types of sensors that detectmotion, sensors used for error correction of the IMU, or somecombination thereof.

In some examples, augmented-reality system 1600 may also include amicrophone array with a plurality of acoustic transducers1620(A)-1620(J), referred to collectively as acoustic transducers 1620.Acoustic transducers 1620 may represent transducers that detect airpressure variations induced by sound waves. Each acoustic transducer1620 may be configured to detect sound and convert the detected soundinto an electronic format (e.g., an analog or digital format). Themicrophone array in FIG. 16 may include, for example, ten acoustictransducers: 1620(A) and 1620(B), which may be designed to be placedinside a corresponding ear of the user, acoustic transducers 1620(C),1620(D), 1620(E), 1620(F), 1620(G), and 1620(H), which may be positionedat various locations on frame 1610, and/or acoustic transducers 1620(I)and 1620(J), which may be positioned on a corresponding neckband 1605.

In some embodiments, one or more of acoustic transducers 1620(A)-(J) maybe used as output transducers (e.g., speakers). For example, acoustictransducers 1620(A) and/or 1620(B) may be earbuds or any other suitabletype of headphone or speaker.

The configuration of acoustic transducers 1620 of the microphone arraymay vary. While augmented-reality system 1600 is shown in FIG. 16 ashaving ten acoustic transducers 1620, the number of acoustic transducers1620 may be greater or less than ten. In some embodiments, using highernumbers of acoustic transducers 1620 may increase the amount of audioinformation collected and/or the sensitivity and accuracy of the audioinformation. In contrast, using a lower number of acoustic transducers1620 may decrease the computing power required by an associatedcontroller 1650 to process the collected audio information. In addition,the position of each acoustic transducer 1620 of the microphone arraymay vary. For example, the position of an acoustic transducer 1620 mayinclude a defined position on the user, a defined coordinate on frame1610, an orientation associated with each acoustic transducer 1620, orsome combination thereof.

Acoustic transducers 1620(A) and 1620(B) may be positioned on differentparts of the user's ear, such as behind the pinna, behind the tragus,and/or within the auricle or fossa. Or, there may be additional acoustictransducers 1620 on or surrounding the ear in addition to acoustictransducers 1620 inside the ear canal. Having an acoustic transducer1620 positioned next to an ear canal of a user may enable the microphonearray to collect information on how sounds arrive at the ear canal. Bypositioning at least two of acoustic transducers 1620 on either side ofa user's head (e.g., as binaural microphones), augmented-reality device1600 may simulate binaural hearing and capture a 3D stereo sound fieldaround about a user's head. In some embodiments, acoustic transducers1620(A) and 1620(B) may be connected to augmented-reality system 1600via a wired connection 1630, and in other embodiments acoustictransducers 1620(A) and 1620(B) may be connected to augmented-realitysystem 1600 via a wireless connection (e.g., a Bluetooth connection). Instill other embodiments, acoustic transducers 1620(A) and 1620(B) maynot be used at all in conjunction with augmented-reality system 1600.

Acoustic transducers 1620 on frame 1610 may be positioned in a varietyof different ways, including along the length of the temples, across thebridge, above or below display devices 1615(A) and 1615(B), or somecombination thereof. Acoustic transducers 1620 may also be oriented suchthat the microphone array is able to detect sounds in a wide range ofdirections surrounding the user wearing the augmented-reality system1600. In some embodiments, an optimization process may be performedduring manufacturing of augmented-reality system 1600 to determinerelative positioning of each acoustic transducer 1620 in the microphonearray.

In some examples, augmented-reality system 1600 may include or beconnected to an external device (e.g., a paired device), such asneckband 1605. Neckband 1605 generally represents any type or form ofpaired device. Thus, the following discussion of neckband 1605 may alsoapply to various other paired devices, such as charging cases, smartwatches, smart phones, wrist bands, other wearable devices, hand-heldcontrollers, tablet computers, laptop computers, other external computedevices, etc.

As shown, neckband 1605 may be coupled to eyewear device 1602 via one ormore connectors. The connectors may be wired or wireless and may includeelectrical and/or non-electrical (e.g., structural) components. In somecases, eyewear device 1602 and neckband 1605 may operate independentlywithout any wired or wireless connection between them. While FIG. 16illustrates the components of eyewear device 1602 and neckband 1605 inexample locations on eyewear device 1602 and neckband 1605, thecomponents may be located elsewhere and/or distributed differently oneyewear device 1602 and/or neckband 1605. In some embodiments, thecomponents of eyewear device 1602 and neckband 1605 may be located onone or more additional peripheral devices paired with eyewear device1602, neckband 1605, or some combination thereof.

Pairing external devices, such as neckband 1605, with augmented-realityeyewear devices may enable the eyewear devices to achieve the formfactor of a pair of glasses while still providing sufficient battery andcomputation power for expanded capabilities. Some or all of the batterypower, computational resources, and/or additional features ofaugmented-reality system 1600 may be provided by a paired device orshared between a paired device and an eyewear device, thus reducing theweight, heat profile, and form factor of the eyewear device overallwhile still retaining desired functionality. For example, neckband 1605may allow components that would otherwise be included on an eyeweardevice to be included in neckband 1605 since users may tolerate aheavier weight load on their shoulders than they would tolerate on theirheads. Neckband 1605 may also have a larger surface area over which todiffuse and disperse heat to the ambient environment. Thus, neckband1605 may allow for greater battery and computation capacity than mightotherwise have been possible on a stand-alone eyewear device. Sinceweight carried in neckband 1605 may be less invasive to a user thanweight carried in eyewear device 1602, a user may tolerate wearing alighter eyewear device and carrying or wearing the paired device forgreater lengths of time than a user would tolerate wearing a heavystandalone eyewear device, thereby enabling users to more fullyincorporate artificial-reality environments into their day-to-dayactivities.

Neckband 1605 may be communicatively coupled with eyewear device 1602and/or to other devices. These other devices may provide certainfunctions (e.g., tracking, localizing, depth mapping, processing,storage, etc.) to augmented-reality system 1600. In the embodiment ofFIG. 16 , neckband 1605 may include two acoustic transducers (e.g.,1620(I) and 1620(J)) that are part of the microphone array (orpotentially form their own microphone subarray). Neckband 1605 may alsoinclude a controller 1625 and a power source 1635.

Acoustic transducers 1620(I) and 1620(J) of neckband 1605 may beconfigured to detect sound and convert the detected sound into anelectronic format (analog or digital). In the embodiment of FIG. 16 ,acoustic transducers 1620(I) and 1620(J) may be positioned on neckband1605, thereby increasing the distance between the neckband acoustictransducers 1620(I) and 1620(J) and other acoustic transducers 1620positioned on eyewear device 1602. In some cases, increasing thedistance between acoustic transducers 1620 of the microphone array mayimprove the accuracy of beamforming performed via the microphone array.For example, if a sound is detected by acoustic transducers 1620(C) and1620(D) and the distance between acoustic transducers 1620(C) and1620(D) is greater than, e.g., the distance between acoustic transducers1620(D) and 1620(E), the determined source location of the detectedsound may be more accurate than if the sound had been detected byacoustic transducers 1620(D) and 1620(E).

Controller 1625 of neckband 1605 may process information generated bythe sensors on neckband 1605 and/or augmented-reality system 1600. Forexample, controller 1625 may process information from the microphonearray that describes sounds detected by the microphone array. For eachdetected sound, controller 1625 may perform a direction-of-arrival (DOA)estimation to estimate a direction from which the detected sound arrivedat the microphone array. As the microphone array detects sounds,controller 1625 may populate an audio data set with the information. Inembodiments in which augmented-reality system 1600 includes an inertialmeasurement unit, controller 1625 may compute all inertial and spatialcalculations from the IMU located on eyewear device 1602. A connectormay convey information between augmented-reality system 1600 andneckband 1605 and between augmented-reality system 1600 and controller1625. The information may be in the form of optical data, electricaldata, wireless data, or any other transmittable data form. Moving theprocessing of information generated by augmented-reality system 1600 toneckband 1605 may reduce weight and heat in eyewear device 1602, makingit more comfortable to the user.

Power source 1635 in neckband 1605 may provide power to eyewear device1602 and/or to neckband 1605. Power source 1635 may include, withoutlimitation, lithium ion batteries, lithium-polymer batteries, primarylithium batteries, alkaline batteries, or any other form of powerstorage. In some cases, power source 1635 may be a wired power source.Including power source 1635 on neckband 1605 instead of on eyeweardevice 1602 may help better distribute the weight and heat generated bypower source 1635.

As noted, some artificial-reality systems may, instead of blending anartificial reality with actual reality, substantially replace one ormore of a user's sensory perceptions of the real world with a virtualexperience. One example of this type of system is a head-worn displaysystem, such as virtual-reality system 1700 in FIG. 17 , that mostly orcompletely covers a user's field of view. Virtual-reality system 1700may include a front rigid body 1702 and a band 1704 shaped to fit arounda user's head. Virtual-reality system 1700 may also include output audiotransducers 1706(A) and 1706(B). Furthermore, while not shown in FIG. 17, front rigid body 1702 may include one or more electronic elements,including one or more electronic displays, one or more inertialmeasurement units (IMUS), one or more tracking emitters or detectors,and/or any other suitable device or system for creating anartificial-reality experience.

Artificial-reality systems may include a variety of types of visualfeedback mechanisms. For example, display devices in augmented-realitysystem 1600 and/or virtual-reality system 1700 may include one or moreliquid crystal displays (LCDs), light emitting diode (LED) displays,organic LED (OLED) displays, digital light project (DLP) micro-displays,liquid crystal on silicon (LCoS) micro-displays, and/or any othersuitable type of display screen. These artificial-reality systems mayinclude a single display screen for both eyes or may provide a displayscreen for each eye, which may allow for additional flexibility forvarifocal adjustments or for correcting a user's refractive error. Someof these artificial-reality systems may also include optical subsystemshaving one or more lenses (e.g., conventional concave or convex lenses,Fresnel lenses, adjustable liquid lenses, etc.) through which a user mayview a display screen. These optical subsystems may serve a variety ofpurposes, including to collimate (e.g., make an object appear at agreater distance than its physical distance), to magnify (e.g., make anobject appear larger than its actual size), and/or to relay (to, e.g.,the viewer's eyes) light. These optical subsystems may be used in anon-pupil-forming architecture (such as a single lens configuration thatdirectly collimates light but results in so-called pincushiondistortion) and/or a pupil-forming architecture (such as a multi-lensconfiguration that produces so-called barrel distortion to nullifypincushion distortion).

In addition to or instead of using display screens, some of theartificial-reality systems described herein may include one or moreprojection systems. For example, display devices in augmented-realitysystem 1600 and/or virtual-reality system 1700 may include micro-LEDprojectors that project light (using, e.g., a waveguide) into displaydevices, such as clear combiner lenses that allow ambient light to passthrough. The display devices may refract the projected light toward auser's pupil and may enable a user to simultaneously view bothartificial-reality content and the real world. The display devices mayaccomplish this using any of a variety of different optical components,including waveguide components (e.g., holographic, planar, diffractive,polarized, and/or reflective waveguide elements), light-manipulationsurfaces and elements (such as diffractive, reflective, and refractiveelements and gratings), coupling elements, etc. Artificial-realitysystems may also be configured with any other suitable type or form ofimage projection system, such as retinal projectors used in virtualretina displays.

The artificial-reality systems described herein may also include varioustypes of computer vision components and subsystems. For example,augmented-reality system 1600 and/or virtual-reality system 1700 mayinclude one or more optical sensors, such as two-dimensional (2D) or 3Dcameras, structured light transmitters and detectors, time-of-flightdepth sensors, single-beam or sweeping laser rangefinders, 3D LiDARsensors, and/or any other suitable type or form of optical sensor. Anartificial-reality system may process data from one or more of thesesensors to identify a location of a user, to map the real world, toprovide a user with context about real-world surroundings, and/or toperform a variety of other functions.

The artificial-reality systems described herein may also include one ormore input and/or output audio transducers. Output audio transducers mayinclude voice coil speakers, ribbon speakers, electrostatic speakers,piezoelectric speakers, bone conduction transducers, cartilageconduction transducers, tragus-vibration transducers, and/or any othersuitable type or form of audio transducer. Similarly, input audiotransducers may include condenser microphones, dynamic microphones,ribbon microphones, and/or any other type or form of input transducer.In some embodiments, a single transducer may be used for both audioinput and audio output.

In some embodiments, the artificial-reality systems described herein mayalso include tactile (e.g., haptic) feedback systems, which may beincorporated into headwear, gloves, body suits, handheld controllers,environmental devices (e.g., chairs, floormats, etc.), and/or any othertype of device or system. Haptic feedback systems may provide varioustypes of cutaneous feedback, including vibration, force, traction,texture, and/or temperature. Haptic feedback systems may also providevarious types of kinesthetic feedback, such as motion and compliance.Haptic feedback may be implemented using motors, piezoelectricactuators, fluidic systems, and/or a variety of other types of feedbackmechanisms. Haptic feedback systems may be implemented independent ofother artificial-reality devices, within other artificial-realitydevices, and/or in conjunction with other artificial-reality devices.

By providing haptic sensations, audible content, and/or visual content,artificial-reality systems may create an entire virtual experience orenhance a user's real-world experience in a variety of contexts andenvironments. For instance, artificial-reality systems may assist orextend a user's perception, memory, or cognition within a particularenvironment. Some systems may enhance a user's interactions with otherpeople in the real world or may enable more immersive interactions withother people in a virtual world. Artificial-reality systems may also beused for educational purposes (e.g., for teaching or training inschools, hospitals, government organizations, military organizations,business enterprises, etc.), entertainment purposes (e.g., for playingvideo games, listening to music, watching video content, etc.), and/orfor accessibility purposes (e.g., as hearing aids, visual aids, etc.).The embodiments disclosed herein may enable or enhance a user'sartificial-reality experience in one or more of these contexts andenvironments and/or in other contexts and environments.

As noted, artificial-reality systems 1600 and 1700 may be used with avariety of other types of devices to provide a more compellingartificial-reality experience. These devices may be haptic interfaceswith transducers that provide haptic feedback and/or that collect hapticinformation about a user's interaction with an environment. Theartificial-reality systems disclosed herein may include various types ofhaptic interfaces that detect or convey various types of hapticinformation, including tactile feedback (e.g., feedback that a userdetects via nerves in the skin, which may also be referred to ascutaneous feedback) and/or kinesthetic feedback (e.g., feedback that auser detects via receptors located in muscles, joints, and/or tendons).

Haptic feedback may be provided by interfaces positioned within a user'senvironment (e.g., chairs, tables, floors, etc.) and/or interfaces onarticles that may be worn or carried by a user (e.g., gloves,wristbands, etc.). As an example, FIG. 18 illustrates a vibrotactilesystem 1800 in the form of a wearable glove (haptic device 1810) andwristband (haptic device 1820). Haptic device 1810 and haptic device1820 are shown as examples of wearable devices that include a flexible,wearable textile material 1830 that is shaped and configured forpositioning against a user's hand and wrist, respectively. Thisdisclosure also includes vibrotactile systems that may be shaped andconfigured for positioning against other human body parts, such as afinger, an arm, a head, a torso, a foot, or a leg. By way of example andnot limitation, vibrotactile systems according to various embodiments ofthe present disclosure may also be in the form of a glove, a headband,an armband, a sleeve, a head covering, a sock, a shirt, or pants, amongother possibilities. In some examples, the term “textile” may includeany flexible, wearable material, including woven fabric, non-wovenfabric, leather, cloth, a flexible polymer material, compositematerials, etc.

One or more vibrotactile devices 1840 may be positioned at leastpartially within one or more corresponding pockets formed in textilematerial 1830 of vibrotactile system 1800. Vibrotactile devices 1840 maybe positioned in locations to provide a vibrating sensation (e.g.,haptic feedback) to a user of vibrotactile system 1800. For example,vibrotactile devices 1840 may be positioned against the user'sfinger(s), thumb, or wrist, as shown in FIG. 18 . Vibrotactile devices1840 may, in some examples, be sufficiently flexible to conform to orbend with the user's corresponding body part(s).

A power source 1850 (e.g., a battery) for applying a voltage to thevibrotactile devices 1840 for activation thereof may be electricallycoupled to vibrotactile devices 1840, such as via conductive wiring1852. In some examples, each of vibrotactile devices 1840 may beindependently electrically coupled to power source 1850 for individualactivation. In some embodiments, a processor 1860 may be operativelycoupled to power source 1850 and configured (e.g., programmed) tocontrol activation of vibrotactile devices 1840.

Vibrotactile system 1800 may be implemented in a variety of ways. Insome examples, vibrotactile system 1800 may be a standalone system withintegral subsystems and components for operation independent of otherdevices and systems. As another example, vibrotactile system 1800 may beconfigured for interaction with another device or system 1870. Forexample, vibrotactile system 1800 may, in some examples, include acommunications interface 1880 for receiving and/or sending signals tothe other device or system 1870. The other device or system 1870 may bea mobile device, a gaming console, an artificial-reality (e.g.,virtual-reality, augmented-reality, mixed-reality) device, a personalcomputer, a tablet computer, a network device (e.g., a modem, a router,etc.), a handheld controller, etc. Communications interface 1880 mayenable communications between vibrotactile system 1800 and the otherdevice or system 1870 via a wireless (e.g., Wi-Fi, Bluetooth, cellular,radio, etc.) link or a wired link. If present, communications interface1880 may be in communication with processor 1860, such as to provide asignal to processor 1860 to activate or deactivate one or more of thevibrotactile devices 1840.

Vibrotactile system 1800 may optionally include other subsystems andcomponents, such as touch-sensitive pads 1890, pressure sensors, motionsensors, position sensors, lighting elements, and/or user interfaceelements (e.g., an on/off button, a vibration control element, etc.).During use, vibrotactile devices 1840 may be configured to be activatedfor a variety of different reasons, such as in response to the user'sinteraction with user interface elements, a signal from the motion orposition sensors, a signal from the touch-sensitive pads 1890, a signalfrom the pressure sensors, a signal from the other device or system1870, etc.

Although power source 1850, processor 1860, and communications interface1880 are illustrated in FIG. 18 as being positioned in haptic device1820, the present disclosure is not so limited. For example, one or moreof power source 1850, processor 1860, or communications interface 1880may be positioned within haptic device 1810 or within another wearabletextile.

Haptic wearables, such as those shown in and described in connectionwith FIG. 18 , may be implemented in a variety of types ofartificial-reality systems and environments. FIG. 19 shows an exampleartificial-reality environment 1900 including one head-mountedvirtual-reality display and two haptic devices (e.g., gloves), and inother embodiments any number and/or combination of these components andother components may be included in an artificial-reality system. Forexample, in some embodiments there may be multiple head-mounted displayseach having an associated haptic device, with each head-mounted displayand each haptic device communicating with the same console, portablecomputing device, or other computing system.

Head-mounted display 1902 generally represents any type or form ofvirtual-reality system, such as virtual-reality system 1700 in FIG. 17 .Haptic device 1904 generally represents any type or form of wearabledevice, worn by a user of an artificial-reality system, that provideshaptic feedback to the user to give the user the perception that he orshe is physically engaging with a virtual object. In some embodiments,haptic device 1904 may provide haptic feedback by applying vibration,motion, and/or force to the user. For example, haptic device 1904 maylimit or augment a user's movement. To give a specific example, hapticdevice 1904 may limit a user's hand from moving forward so that the userhas the perception that his or her hand has come in physical contactwith a virtual wall. In this specific example, one or more actuatorswithin the haptic device may achieve the physical-movement restrictionby pumping fluid into an inflatable bladder of the haptic device. Insome examples, a user may also use haptic device 1904 to send actionrequests to a console. Examples of action requests include, withoutlimitation, requests to start an application and/or end the applicationand/or requests to perform a particular action within the application.

While haptic interfaces may be used with virtual-reality systems, asshown in FIG. 19 , haptic interfaces may also be used withaugmented-reality systems, as shown in FIG. 20 . FIG. 20 is aperspective view of a user 2010 interacting with an augmented-realitysystem 2000. In this example, user 2010 may wear a pair ofaugmented-reality glasses 2020 that may have one or more displays 2022and that are paired with a haptic device 2030. In this example, hapticdevice 2030 may be a wristband that includes a plurality of bandelements 2032 and a tensioning mechanism 2034 that connects bandelements 2032 to one another.

One or more of band elements 2032 may include any type or form ofactuator suitable for providing haptic feedback. For example, one ormore of band elements 2032 may be configured to provide one or more ofvarious types of cutaneous feedback, including vibration, force,traction, texture, and/or temperature. To provide such feedback, bandelements 2032 may include one or more of various types of actuators. Inone example, each of band elements 2032 may include a vibrotactor (e.g.,a vibrotactile actuator) configured to vibrate in unison orindependently to provide one or more of various types of hapticsensations to a user. Alternatively, only a single band element or asubset of band elements may include vibrotactors.

Haptic devices 1810, 1820, 1904, and 2030 may include any suitablenumber and/or type of haptic transducer, sensor, and/or feedbackmechanism. For example, haptic devices 1810, 1820, 1904, and 2030 mayinclude one or more mechanical transducers, piezoelectric transducers,and/or fluidic transducers. Haptic devices 1810, 1820, 1904, and 2030may also include various combinations of different types and forms oftransducers that work together or independently to enhance a user'sartificial-reality experience. In one example, each of band elements2032 of haptic device 2030 may include a vibrotactor (e.g., avibrotactile actuator) configured to vibrate in unison or independentlyto provide one or more of various types of haptic sensations to a user.

FIG. 21A illustrates an exemplary human-machine interface (also referredto herein as an EMG control interface) configured to be worn around auser's lower arm or wrist as a wearable system 900. In this example,wearable system 2100 may include sixteen neuromuscular sensors 2110(e.g., EMG sensors) arranged circumferentially around an elastic band2120. However, any suitable number of neuromuscular sensors may be used.The number and arrangement of neuromuscular sensors may depend on theparticular application for which the wearable device is used. Forexample, a wearable armband or wristband may be used to generate controlinformation for controlling an augmented reality system, a robot,controlling a vehicle, scrolling through text, controlling a virtualavatar, or any other suitable control task. As shown, the sensors may becoupled together using flexible electronics incorporated into thewireless device. FIG. 21B illustrates a cross-sectional view through oneof the sensors of the wearable device shown in FIG. 21A. In someembodiments, the output of one or more of the sensing components may beoptionally processed using hardware signal processing circuitry (e.g.,to perform amplification, filtering, and/or rectification). In otherembodiments, at least some signal processing of the output of thesensing components may be performed in software. Thus, signal processingof signals sampled by the sensors may be performed in hardware,software, or by any suitable combination of hardware and software, asaspects of the technology described herein are not limited in thisrespect. A non-limiting example of a signal processing chain used toprocess recorded data from sensors 2110 is discussed in more detailbelow with reference to FIGS. 22A and 22B.

FIGS. 22A and 22B illustrate an exemplary schematic diagram withinternal components of a wearable system with EMG sensors. As shown, thewearable system may include a wearable portion 2210 (FIG. 22A) and adongle portion 2220 (FIG. 22B) in communication with the wearableportion 2210 (e.g., via BLUETOOTH or another suitable wirelesscommunication technology). As shown in FIG. 22A, the wearable portion2210 includes sensors 2110, examples of which are described inconnection with FIGS. 21A and 21B. The output of the sensors 2110 isprovided to analog front end 2230, which may be configured to performanalog processing (e.g., amplification, noise reduction, filtering,etc.) on the recorded signals. The processed analog signals are thenprovided to analog-to-digital converter 2232, which may convert theanalog signals to digital signals that may be processed by one or morecomputer processors. An example of a computer processor that may be usedin accordance with some embodiments is microcontroller (MCU) 2234,illustrated in FIG. 22A. As shown, MCU 2234 may also include inputs fromother sensors (e.g., IMU sensor 2240), and power and battery module2242. The output of the processing performed by MCU may be provided toantenna 2250 for transmission to dongle portion 2220 shown in FIG. 22B.

Dongle portion 2220 includes antenna 2252 configured to communicate withantenna 2250 included as part of wearable portion 2210. Communicationbetween antenna 2250 and 2252 may occur using any suitable wirelesstechnology and protocol, non-limiting examples of which includeradiofrequency signaling and BLUETOOTH. As shown, the signals receivedby antenna 2252 of dongle portion 2220 may be provided to a hostcomputer for further processing, display, and/or for effecting controlof a particular physical or virtual object or objects.

Although the examples provided with reference to FIGS. 21A-21B and FIGS.22A-22B are discussed in the context of interfaces with EMG sensors, thetechniques described herein for reducing electromagnetic interferencemay also be implemented in wearable interfaces with other types ofsensors including, but not limited to, mechanomyography (MMG) sensors,sonomyography (SMG) sensors, and electrical impedance tomography (EIT)sensors. The techniques described herein for reducing electromagneticinterference may also be implemented in wearable interfaces thatcommunicate with computer hosts through wires and cables (e.g., USBcables, optical fiber cables, etc.).

The above-described embodiments can be implemented in any of numerousways. For example, the embodiments may be implemented using hardware,software or a combination thereof. When implemented in software, thesoftware code can be executed on any suitable processor or collection ofprocessors, whether provided in a single computer or distributed amongmultiple computers. It should be appreciated that any component orcollection of components that perform the functions described above canbe generically considered as one or more controllers that control theabove-discussed functions. The one or more controllers can beimplemented in numerous ways, such as with dedicated hardware or withone or more processors programmed using microcode or software to performthe functions recited above.

In this respect, it should be appreciated that one implementation of theembodiments of the present invention comprises at least onenon-transitory computer readable storage medium (e.g., a computermemory, a portable memory, a compact disk, etc.) encoded with a computerprogram (e.g., a plurality of instructions), that, when executed on aprocessor, performs the above-discussed functions of the embodiments ofthe present invention. The computer-readable storage medium can betransportable such that the program stored thereon can be loaded ontoany computer resource to implement the aspects of the present inventiondiscussed herein. In addition, it should be appreciated that thereference to a computer program that, when executed, performs theabove-discussed functions, is not limited to an application programrunning on a host computer. Rather, the term computer program is usedherein in a generic sense to reference any type of computer code (e.g.,software or microcode) that can be employed to program a processor toimplement the above-discussed aspects of the present invention.

Various aspects of the present invention may be used alone, incombination, or in a variety of arrangements not specifically discussedin the embodiments described in the foregoing and are therefore notlimited in their application to the details and arrangement ofcomponents set forth in the foregoing description or illustrated in thedrawings. For example, aspects described in one embodiment may becombined in any manner with aspects described in other embodiments.

Also, embodiments of the invention may be implemented as one or moremethods, of that an example has been provided. The acts performed aspart of the method(s) may be ordered in any suitable way. Accordingly,embodiments may be constructed in that acts are performed in an orderdifferent than illustrated, that may include performing some actssimultaneously, even though shown as sequential acts in illustrativeembodiments.

Use of ordinal terms such as “first,” “second,” “third,” etc., in theclaims to modify a claim element does not by itself connote anypriority, precedence, or order of one claim element over another or thetemporal order in that acts of a method are performed. Such terms areused merely as labels to distinguish one claim element having a certainname from another element having a same name (but for use of the ordinalterm).

The phraseology and terminology used herein is for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” “having,” “containing,” “involving,” andvariations thereof, is meant to encompass the items listed thereafterand additional items.

Having described several embodiments of the invention in detail, variousmodifications and improvements will readily occur to those skilled inthe art. Such modifications and improvements are intended to be withinthe spirit and scope of the invention. Accordingly, the foregoingdescription is by way of example only, and is not intended as limiting.

By way of non-limiting examples, the following embodiments are includedin the present disclosure.

Example 1: A system comprising a watch band, a watch body comprising atleast one image sensor configured to capture a wide-angle image, acoupling mechanism configured to detachably couple the watch body to thewatch band, and at least one biometric sensor on at least one of thewatch band or the watch body.

Example 2: The system of Example 1, wherein the watch body is configuredto operate independently from the watch band, and the watch body and thewatch band are configured to communicate with each other.

Example 3: The system of Example 1 or Example 2, wherein a level offunctionality of at least one of the watch band or the watch body ismodified when the watch body is detached from the watch band.

Example 4: The system of any of Examples 1 through 3, wherein thewide-angle image comprises a plurality of images stitched together froma plurality of image sensors of the watch body.

Example 5: The system of any of Examples 1 through 4, wherein the systemis configured to determine an orientation of a display of the watch bodyrelative to an eye gaze direction of a user and orient content viewed onthe display to the eye gaze direction of the user.

Example 6: The system of any of Examples 1 through 5, further comprisinga head-mounted display, wherein the watch body is communicativelycoupled to the head-mounted display and the head-mounted display isconfigured to display at least a portion of the captured image.

Example 7: The system of Example 6, further comprising at least oneneuromuscular sensor, wherein the watch body is configured to transmitdata captured by the at least one neuromuscular sensor to thehead-mounted display and the data captured by the at least oneneuromuscular sensor comprises a muscle intention of a user.

Example 8: The system of Example 7, wherein the head-mounted display isconfigured to enhance a user interaction with an object within anartificial-reality environment based on the muscle intention.

Example 9: The system of any of Examples 1 through 8, wherein thehead-mounted display is configured to enhance a user interaction with anobject within an artificial-reality environment based on the muscleintention.

Example 10: The system of any of Examples 1 through 9, furthercomprising a head-mounted display, wherein the watch band furthercomprises a haptic actuator that is configured to provide hapticfeedback to a user based on at least one of instructions from the watchbody or instructions from the head-mounted display.

Example 11: The system of any of Examples 1 through 10, wherein thecoupling mechanism is configured to couple the watch body to the watchband by application of at least one of a substantially linear force tothe watch body towards the watch band in a first direction or asubstantially rotational force to the watch body relative to the watchband in a second direction and decouple the watch body from the watchband by application of at least one of a substantially linear force tothe watch body towards the watch band in a third direction opposite thefirst direction or a substantially rotational force to the watch bodyrelative to the watch band in a fourth direction opposite the seconddirection.

Example 12: The system of any of Examples 1 through 11, wherein thecoupling mechanism comprises at least one spring-loaded button disposedon the watch body, at least one first magnet disposed on the watch body,at least one second magnet disposed on the watch band, wherein amagnetic attraction between the at least one first magnet and the atleast one second magnet aligns the watch body relative to the watch bandprior to coupling the watch body to the watch band, and at least one pinconfigured to retract and to decouple the watch body from the watch bandas a result of pressing the at least one spring-loaded button.

Example 13: The system of any of Examples 1 through 12, wherein thecoupling mechanism comprises at least one spring-loaded button disposedon the watch body, wherein pressing the at least one spring-loadedbutton is configured to cause at least one of modifying a function ofthe watch body or decoupling the watch body from the watch band.

Example 14: The system of any of Examples 1 through 13, wherein thewatch band comprises a first profile between the watch body and thewatch band along a first perimeter edge of the watch band and a secondprofile between the watch body and the watch band along a secondperimeter edge of the watch band, wherein the watch body and the watchband are not in contact with each other along the first profile when thewatch body is coupled to the watch band and the watch body and the watchband are in contact with each other along at least a portion of thesecond profile when the watch body is coupled to the watch band.

Example 15: The system of any of Examples 1 through 14, wherein thecoupling mechanism comprises at least one first spring configured toapply a radially outward force to at least one first pawl, at least onesecond spring configured to apply a radially outward force to at leastone second pawl, a first angled surface disposed on an upper end of theat least one first pawl that is configured to engage a first locksurface of the watch band to secure the watch body to the watch band ina linear direction, and a second angled surface disposed on a side ofthe at least one second pawl that is configured to engage a second locksurface of the watch band to secure the watch body to the watch band ina rotational direction.

Example 16: The system of any of Examples 1 through 15, wherein thecoupling mechanism is configured to couple the watch body to the watchband by application of a substantially linear force to the watch bodytowards the watch band and decouple the watch body from the watch bandby pressing at least one spring loaded button disposed on the watchbody.

Example 17: The system of any of Examples 1 through 16 wherein thecoupling mechanism comprises at least one spring-loaded button disposedon the watch body, at least one lock bar configured to shift in positionas a result of pressing the at least one spring-loaded button, and atleast one pin configured to retract and to decouple the watch body fromthe watch band as a result of the shifting of the position of the atleast one lock bar.

Example 18: The system of any of Examples 1 through 17, wherein thecoupling mechanism further comprises a lock bar spring configured toapply a retaining force to the at least one lock bar, and an angledsurface on the at least one lock bar configured to transfer theretaining force to the at least one pin, wherein the at least one pin ispositioned to transfer the retaining force to the watch band with aforce component in a direction to retain the watch body against thewatch band.

Example 19: The system of any of Examples 1 through 18, furthercomprising first electrical contacts disposed on the watch body andcomplementary second electrical contacts disposed on the watch band,wherein the retaining force maintains an electrical connection betweenthe first electrical contacts and the second electrical contacts whenthe watch body is coupled to the watch band.

Example 20: A method, comprising determining at least one computing taskof a head-mounted display (HMD) that is suitable for processing onavailable computing resources of a watch body, selectively offloadingthe at least one computing task of the HMD that is suitable forprocessing on the available computing resources of the watch body to thewatch body, processing, by the available computing resources of thewatch body, the at least one computing task, and sending results of theprocessed at least one computing task to the HMD.

Example 21: The method of Example 20, wherein the at least one computingtask comprises at least one of an image processing task, a locationdetermining task, a neural network processing task, or a graphicsprocessing task.

Example 22: The method of Example 20 or Example 21, further comprisingreducing a power consumption of the HMD by selectively offloading the atleast one computing task of the HMD to the watch body.

Example 23: The method of any of Examples 20 through 22, furthercomprising reducing heat generated within the HMD by selectivelyoffloading the at least one computing task of the HMD to the watch body.

Example 24: A system comprising a watch band and a watch body detachablycoupled to the watch band, the watch body comprising a front face, arear face opposite the front face, a first image sensor in the frontface, and a second image sensor in the rear face,

Example 25: The system of Example 21, wherein the second image sensor isdisposed adjacent to skin of a user of the wristband system when thewatch body is coupled to the watch band and the wristband system isdonned by the user, and the second image sensor is configured to acquirea biometric of the user.

Example 26: The system of any of Example 21 or Example 22, wherein thefirst image sensor is oriented to capture a first wide-angle image in afirst direction, the second image sensor is oriented to capture a secondwide-angle image in a second direction opposite the first direction, anda processor of the wristband system is configured to stitch the firstwide-angle image and the second wide-angle image together to create aseamless panoramic image.

Example 27: The system of any of Examples 21 through 23, wherein thesecond image sensor is activated in response to the watch body beingdetached from the watch band.

Example 28: The system of any of Examples 21 through 24, furthercomprising at least one biometric sensor in the rear face, wherein thebiometric sensor is activated in response to the watch body beingattached to the watch band.

Example 29: A method, comprising determining at least one computing taskof a watch body that is suitable for processing on available computingresources of a head-mounted display (HMD), selectively offloading the atleast one computing task of the watch body that is suitable forprocessing on the available computing resources of the HMD to the HMD,processing, by the available computing resources of the HMD, the atleast one computing task, and sending results of the processed at leastone computing task to the watch body.

Example 30: A system comprising a wearable device, a head-mounteddisplay (HMD), a smartphone, a server, and an electronic device, whereinthe wearable device selectively offloads at least one computing task ofthe wearable device to available computing resources of at least one ofthe HMD, the smartphone, the server, or the electronic device.

Example 31: A system comprising a wearable device, a head-mounteddisplay (HMD), a smartphone, a server, and an electronic device, whereinat least one of the HMD, the smartphone, the server, or the electronicdevice selectively offloads at least one computing task to availablecomputing resources of the wearable device.

Example 32: A non-transitory computer-readable medium encoded withinstructions that, when executed by at least one computer processorperforms a method of determining at least one computing task of ahead-mounted display (HMD) that is suitable for processing on availablecomputing resources of a watch body, selectively offloading the at leastone computing task of the HMD that is suitable for processing on theavailable computing resources of the watch body to the watch body,processing, by the available computing resources of the watch body, theat least one computing task, and sending results of the processed atleast one computing task to the HMD.

Example 33: A wearable device, comprising a watch band, a watch bodycomprising (i) a front face, (ii) a rear face opposite the front face,(iii) a first image sensor in the front face; and (iv) a second imagesensor in the rear face, a coupling mechanism configured to detachablycouple the watch body to the watch band, and one or more processors, andmemory storing one or more programs configured to be executed by the oneor more processors, the one or more programs including instructions fordetecting, at a first time, that the watch body is coupled to the watchband via the coupling mechanism, in response to detecting that the watchbody is coupled to the watch body via the coupling mechanism, permittingactivation of the first image sensor by a user, detecting, at a secondtime, that the watch body is not coupled to the watch band via thecoupling mechanism, and in response to detecting that the watch body isnot coupled to the watch band via the coupling mechanism, activating thesecond image sensor without user input.

Example 34: The wearable device of Example 33, wherein the one or moreprograms further include instructions for not permitting activation ofthe second image sensor by the user in response to detecting that thewatch body is coupled to the watch body via the coupling mechanism.

Example 35: The wearable device of Example 33 or Example 34 furthercomprising at least one additional sensor coupled to the wrist band, thewatch body, or the coupling mechanism, the at least one additionalsensor being configured to measure coupling between the watch body iscoupled to the watch band, wherein detecting that the watch body iscoupled to the watch band comprises evaluating coupling data generatedby the at least one additional sensor.

Example 36: The wearable device of any of Examples 3 through 35, furthercomprising one or more electrical contacts that connect when the watchbody is coupled to the watch band, wherein detecting that the watch bodyis coupled to the watch band comprises detecting a disconnect betweenthe one or more electrical contacts.

Example 37: The wearable device of any of Examples 33 through 36,wherein the one or more programs further include instructions forreceiving test image data from the second image sensor, and determiningwhether the test image data satisfies an image capture criterion,wherein activating the second image sensor is performed in response todetermining that the test image data satisfies the image capturecriterion.

Example 38: A system, comprising a watch band comprising at least onebiometric sensor that is configured to collect biometric information, awatch body comprising at least one image sensor configured to capture awide-angle image, and a coupling mechanism configured to detachablycouple the watch body to the watch band.

Example 39: The system of Example 38, wherein the watch body isconfigured to operate independently from the watch band, the watch bandis configured to operate independently from the watch body, and thewatch body and the watch band are configured to communicate with eachother.

Example 40: The system of Example 38 or Example 39, wherein a level offunctionality of at least one of the watch band or the watch body ismodified when the watch body is detached from the watch band.

Example 41: The system of any of Examples 38 through 40, wherein thesystem is configured to determine an orientation of a display of thewatch body relative to an eye gaze direction of a user and orientcontent viewed on the display to the eye gaze direction of the user.

Example 42: The system of any of Examples 38 through 41, furthercomprising a head-mounted display, wherein the watch body iscommunicatively coupled to the head-mounted display and the head-mounteddisplay is configured to display at least a portion of the capturedwide-angle image.

Example 43: The system of any of Examples 38 through 42, furthercomprising at least one neuromuscular sensor, wherein the watch body isconfigured to transmit data captured by the at least one neuromuscularsensor to the head-mounted display and the data captured by the at leastone neuromuscular sensor comprises a muscle intention of a user.

Example 44: The system of any of Examples 38 through 43 wherein thehead-mounted display is configured to enhance a user interaction with anobject within an artificial-reality environment based on the muscleintention.

Example 45: The system of any of Examples 38 through 44, furthercomprising a head-mounted display, wherein the watch band furthercomprises a haptic actuator that is configured to provide hapticfeedback to a user based on at least one of instructions from the watchbody or instructions from the head-mounted display.

Example 46: The system of any of Examples 38 through 45, wherein thecoupling mechanism is configured to couple the watch body to the watchband by application of a substantially linear force to the watch bodytowards the watch band and decouple the watch body from the watch bandby at least one of pressing at least one spring loaded button disposedon the watch body or application of a substantially rotational force tothe watch body relative to the watch band.

Example 47: The system of any of Examples 38 through 46, wherein thecoupling mechanism comprises at least one first spring configured toapply a radially outward force to at least one first pawl, at least onesecond spring configured to apply a radially outward force to at leastone second pawl, a first angled surface disposed on an upper end of theat least one first pawl that is configured to engage a first locksurface of the watch band to secure the watch body to the watch band ina linear direction, and a second angled surface disposed on a side ofthe at least one second pawl that is configured to engage a second locksurface of the watch band to secure the watch body to the watch band ina rotational direction.

Example 48: The system of any of Examples 38 through 47, wherein thecoupling mechanism comprises at least one spring-loaded button disposedon the watch body, at least one lock bar configured to shift in positionas a result of pressing the at least one spring-loaded button, and atleast one pin configured to retract and to decouple the watch body fromthe watch band as a result of the shift of the position of the at leastone lock bar.

Example 49: The system of any of Examples 38 through 48, wherein thecoupling mechanism further comprises a lock bar spring configured toapply a retaining force to the at least one lock bar and an angledsurface on the at least one lock bar configured to transfer theretaining force to the at least one pin, wherein the at least one pin ispositioned to transfer the retaining force to the watch band with aforce component in a direction to retain the watch body against thewatch band.

Example 50: The system of any of Examples 38 through 49, wherein the atleast one image sensor comprises a first image sensor and a second imagesensor the first image sensor is oriented to capture a first wide-angleimage in a first direction the second image sensor is oriented tocapture a second wide-angle image in a second direction opposite thefirst direction, and a processor of the system is configured to stitchthe first wide-angle image and the second wide-angle image together tocreate a combined image.

Example 51: The system of any of Examples 38 through 50, wherein the atleast one biometric sensor is disposed on a rear face of the watch bodyand the at least one biometric sensor is configured to be activated inresponse to the watch body being attached to the watch band.

Example 52: A wearable device, comprising a watch band, a watch bodycomprising (i) a front face, (ii) a rear face opposite the front face,(iii) a first image sensor in the front face, and (iv) a second imagesensor in the rear face, a coupling mechanism configured to detachablycouple the watch body to the watch band, one or more processors, andmemory storing one or more programs configured to be executed by the oneor more processors, the one or more programs including instructions fordetecting, at a first time, that the watch body is coupled to the watchband via the coupling mechanism, in response to detecting that the watchbody is coupled to the watch band via the coupling mechanism, permittingactivation of the first image sensor by a user, detecting, at a secondtime, that the watch body is not coupled to the watch band via thecoupling mechanism, and in response to detecting that the watch body isnot coupled to the watch band via the coupling mechanism, activating thesecond image sensor without user input.

Example 53: The wearable device of Example 52, wherein the one or moreprograms further include instructions for not permitting activation ofthe second image sensor by the user in response to detecting that thewatch body is coupled to the watch band via the coupling mechanism.

Example 54: The wearable device of Example 52 or Example 53, furthercomprising at least one proximity sensor coupled to the watch band, thewatch body, or the coupling mechanism, the at least one proximity sensorbeing configured to measure coupling between the watch body and thewatch band, wherein detecting that the watch body is coupled to thewatch band comprises evaluating coupling data generated by the at leastone proximity sensor.

Example 55: The wearable device of any of Examples 52 through 54 furthercomprising one or more electrical contacts that connect when the watchbody is coupled to the watch band, wherein detecting that the watch bodyis coupled to the watch band comprises detecting an electricalconnection between the one or more electrical contacts.

Example 56: The wearable device of any of Examples 52 through 55,wherein the one or more programs further include instructions forreceiving test image data from the second image sensor; and determiningwhether the test image data satisfies an image capture criterion,wherein activating the second image sensor is performed in response todetermining that the test image data satisfies the image capturecriterion.

Example 57: A non-transitory computer-readable medium encoded withinstructions that, when executed by at least one computer processor,performs determining at least one computing task, determining whether toperform the at least one computing task on a watch body or ahead-mounted display (HMD), performing the at least one computing taskon the watch body or the HMD based on the determination of whether toperform the at least one computing task on the watch body or the HMD,sending results of the at least one computing task to the watch bodywhen the HMD performs the at least one computing task, and sendingresults of the at least one computing task to the HMD when the watchbody performs the at least one computing task.

The process parameters and sequence of the steps described and/orillustrated herein are given by way of example only and can be varied asdesired. For example, while the steps illustrated and/or describedherein may be shown or discussed in a particular order, these steps donot necessarily need to be performed in the order illustrated ordiscussed. The various example methods described and/or illustratedherein may also omit one or more of the steps described or illustratedherein or include additional steps in addition to those disclosed.

The preceding description has been provided to enable others skilled inthe art to best utilize various aspects of the example embodimentsdisclosed herein. This example description is not intended to beexhaustive or to be limited to any precise form disclosed. Manymodifications and variations are possible without departing from thespirit and scope of the present disclosure. The embodiments disclosedherein should be considered in all respects illustrative and notrestrictive. Reference should be made to the appended claims and theirequivalents in determining the scope of the present disclosure.

Unless otherwise noted, the terms “connected to” and “coupled to” (andtheir derivatives), as used in the specification and claims, are to beconstrued as permitting both direct and indirect (i.e., via otherelements or components) connection. In addition, the terms “a” or “an,”as used in the specification and claims, are to be construed as meaning“at least one of.” Finally, for ease of use, the terms “including” and“having” (and their derivatives), as used in the specification andclaims, are interchangeable with and have the same meaning as the word“comprising.”

What is claimed is:
 1. A wearable device, comprising: a watch band; awatch body detachable from the watch band and comprising: a front faceincluding a display; a rear face opposite the front face; and at leastone image sensor on the rear face of the watch body, wherein the atleast one image sensor on the rear face of the watch body is configuredto capture an image for displaying on the display; and a couplingmechanism configured to detachably couple the watch body to the watchband.
 2. The wearable device of claim 1, wherein: the watch bodycomprises a first processor; the watch band comprises a secondprocessor; and the first processor and the second processor areconfigured to communicate with each other.
 3. The wearable device ofclaim 1, further comprising at least one coupling sensor configured todetermine when the watch body is attached to the watch band or detachedfrom the watch band, wherein a level of functionality of at least one ofthe watch band or the watch body is modified when the watch body isdetached from the watch band compared when the watch body is attached tothe watch band.
 4. The wearable device of claim 1, wherein the watchband comprises at least one user input device that is configured toreceive a user input for controlling at least one function of the watchbody when the watch body is detached from the watch band.
 5. Thewearable device of claim 4, wherein the at least one user input devicecomprises at least one of: a neuromuscular sensor; a button; or abiometric sensor.
 6. The wearable device of claim 4, wherein the atleast one function of the watch body controlled by receiving the userinput with the at least one user input device comprises capturing theimage with the at least one image sensor.
 7. The wearable device ofclaim 1, wherein the watch body further comprises at least oneadditional image sensor on the front face of the watch body opposite therear face.
 8. The wearable device of claim 7, wherein the watch bodyfurther comprises a processor configured to: determine, from imagestaken by the at least one additional image sensor on the front face ofthe watch body, an orientation of the display relative to an eye gazedirection of a user; and orient content presented on the display basedon the eye gaze direction of the user.
 9. The wearable device of claim1, wherein the watch band comprises at least one neuromuscular sensorconfigured to capture data indicative of a muscle intention of a userwearing the watch band.
 10. The wearable device of claim 1, wherein thecoupling mechanism is configured to: couple the watch body to the watchband by application of at least one of: a substantially linear force tothe watch body towards the watch band; or a substantially rotationalforce to the watch body relative to the watch band; and decouple thewatch body from the watch band by application of at least one of: asubstantially linear force to the watch body away from the watch band;or a substantially rotational force to the watch body relative to thewatch band.
 11. The wearable device of claim 1, wherein the couplingmechanism comprises: at least one button disposed on the watch body,wherein the at least one button is configured to, upon being depressed,cause at least one of: modifying a function of the watch body; ordecoupling the watch body from the watch band.
 12. The wearable deviceof claim 1, further comprising at least one biometric sensor on at leastone of the watch band or the watch body.
 13. The wearable device ofclaim 12, wherein: the at least one biometric sensor is disposed on therear face of the watch body; and the at least one biometric sensor isconfigured to be activated in response to the watch body being attachedto the watch band and to be deactivated in response to the watch bodybeing detached from the watch band.
 14. The wearable device of claim 12,wherein the at least one biometric sensor comprises at least one of: aneuromuscular sensor; a heart rate sensor; or a blood oxygen saturationsensor.
 15. A system, comprising: a watch band, comprising: a firstprocessor; and a first battery configured to provide power to the firstprocessor; and a watch body configured to detachably couple to the watchband, the watch body comprising: a display in a front face of the watchbody, the display configured to display visual content to a user; atleast one image sensor configured to capture an image for displaying onthe display, the at least one image sensor positioned on a rear face ofthe watch body opposite the front face; a second processor configured tocontrol operation of the display and the at least one image sensor; anda second battery configured to provide power to the display, at leastone image sensor, and second processor at least when the watch body isdetached from the watch band.
 16. The system of claim 15, wherein: thewatch band comprises a first wireless transceiver; the watch bodycomprises a second wireless transceiver; and the first processor of thewatch band and the second processor of the watch body are configured tocommunicate with each other via the first wireless transceiver and thesecond wireless transceiver.
 17. The system of claim 15, wherein thesecond processor of the watch body is configured to perform at least onefunction independent from the first processor of the watch band when thewatch body is decoupled from the watch band.
 18. The system of claim 15,wherein the second processor of the watch body is configured to activatethe at least one image sensor as a result of the watch body beingdetached from the watch band and to deactivate the at least one imagesensor as a result of the watch body being coupled to the watch band.19. The system of claim 15, wherein: the watch band further comprises atleast one sensor; and the first processor of the watch band isconfigured to collect and process sensor data from the at least onesensor of the watch band at least when the watch body is detached fromthe watch band.
 20. A wearable device, comprising: a watch bandcomprising a first processor and a first battery; and a watch bodyconfigured to be detachably coupled to the watch band, the watch bodycomprising: a second processor distinct from the first processor; asecond battery distinct from the first battery; a front-facing display;and a rear-facing image sensor positioned to face a user's arm when thewatch body is attached to the watch band and the wearable device is wornon the user's arm, wherein the rear-facing image sensor is configured tocapture an image for displaying on the front-facing display.